New Sobaroeephala-Speeies from the "plumata-group" (Diptera, Clusiidae)

By Á. Soós, Budapest

In the present paper, I submit some new species found in the unidentified material of the United States National Museum, Washington. I wish to express my gratitude, also in this place, to Dr. G . O. S T E Y S K A L , my esteemed colleague and distinguished specialist of the Acalyptratae, for his kind forwarding to me of the valuable research material.

Sobarocephala testacea sp. n.

çf — Basic color brownish-yellow. Head yellow, of various hues; ocellar spot, densely plumate arista, and basal area around arista on th i rd joint deep brownish-black. Upper part of occiput, posterior two-thirds of frons brownish-yellow of a greenish hue; anterior th i rd of frons, median portion of face, mouth-parts, palpi, and antennae light yellow; lower part of occiput, cheeks, post-genae, and facial margins quite light whitish-yellow. Cephalic bristles brownish-black. Notum, pleurae, and scutellum brownish-yellow, but notum a shade darker bilaterally along notopleural suture, while sterno-, and hypopleurae lighter, whitish-yellow. Thoracic bristles brownish-black. Legs brownish-yellow, but tibia of front leg (though basic color also brownish-yellow, yet due to dense black hairs seemingly much darker) and tarsal joints black, all coxae as well as proximal ends of middle and hind femora whitish-yellow. Wings cloudy hyaline, of a pale brownish hue, without any definite or indistinct spots, at most costal margin somewhat darker. Hal tères l ight yellow. Dorsal plates of brownish-yellow abdomen ornamented wi th an irregular, brownish-black pattern: a broad, dark stripe extending medially down to pregenital segment, but stripe more or less expanding at about posterior margin of each tergite. Pregenital and genital segments, as well as hypopygium, unicolorous brownish-yellow.

Head (Fig. 1 : A) hardly, one fif th to one sixth, higher than long, and about one th i rd wider than high. Frons hardly narrowing backwards, one fourth lon­ger than its wid th at anterior margin. Frons, measured at its narrowest point, two fifths of cephalic width. Measured at same point, width of eyes about one th i rd narrower than width of frons. Frons concave, middle of face strongly protrud­ing, its longitudinal median line almost cristate. W i d t h of cheeks about one third of height of eyes. Postgenae strikingly broadening posteriorad; eyes trans-versally elliptical. Postvertical and ocellar bristles about equally strong, both weakly developed. Outer vertical bristles less strong, also about two f i f th shorter than well developed inner verticals. Eight-nine occipital hairs relatively

29 T e r m é s z e t t u d o m á n y i M ú z e u m É v k . 1964. —

weak, upper 6—7 inclinate, lower 2 straight, reclinate. A l l three fronto-orbital bristles nearly equally long, distance between two reclinate fronto-orbital bris­tles two and a half times greater than that between first inclinate and first recli­nate ones. Posterior reclinate fronto-orbital bristle originating about twice as far from margin of eyes as two other fronto-orbitals. Vibrissae well developed, about as long as two thirds of arista, slightly erect and rather inclinate, yet not cross­ing terminally. No buccal hairs (?) behind vibrissae, corner and lower margin of cheeks entirely glabrous, but postero-inferior part of postgenae wi th two genal hairs. Dorsal apical end of second joint wi th a strong, r igid bristle, about as long as ocellar bristle. Third joint subdiscoidal, hairs of densely plumate arista about two and a half to three times as long as its basal diameter.

Notum covered wi th th in , sparse, recumbent brown hairs. Two pairs of posterior dorsocentral bristles subequal, anterior pair only slightly thinner and shorter than posterior one. Pleurae glabrous, wi th some longer hairs only below mesopleural bristle. Two subapical scutellar bristles strong, well developed, slight­ly arched and somewhat convergent; only one pair of lateral bristles pres­ent: extremely th in , short, merely one fourth to one fif th as long as subapical ones. Fore femora wi th well developed antero- and postero-ventral row of bristles. Middle femora only wi th postero-ventral row, but bristles here much denser than on fore femora, while hind femora wi th only 3—4 bristles merely in front of distal apices antero-ventrally. Wing two and a half times as long as wide. Ratio of penultimate and ultimate sections of vein m as 1 : 3.5. Distance between two cross veins one and a half times greater than length of posterior cross vein. Pedicel of haltères short, apical clavus large, proportion of their lengths about 1:1. Abdomen covered wi th relatively long, recumbent, brown hairs. Some few hairs arising on both lateral margins of second tergite. Surstylus

Fig. 1. Sobarocephala testacea sp. n. A — head laterally; B = surstylus viewed posteriorly

(Fig. 1 : B) widely rounded, shaped as an apically widely rounded elongate iso­sceles triangle, entire inner margin fringed wi th strong, black spines.

0 unknown. D i m e n s i o n s : length of body: 3.0 m m ; length of thorax: 1.25 m m ;

length of wing: 2.7 mm. D i s t r i b u t i o n : Cape Henry, Virginia, USA, 28 June, 1939, A L . M E L A N D E R

(Holotype çf). L o c a t i o n o f t y p e : United States National Museum. Washington. The species belongs to those wi th a completely yellow scutellum, and is

closely related to S. dudichi Soós. The distinguishing characters are as follows : S. testacea sp. n. S

1. Bristles of head and thorax dark (brownish-black).

2. Ocellar triangle dark, brownish-black.

3. Cheeks wide, about 1 / 3 of height of eye.

4. Buccal hairs absent. 5. Tarsal joints of fore legs black. 6. Distance between two cross veins

of wing one and a half times greater than length of posterior cross vein.

7. Scutellum with 1 pair of lateral bristles.

8. Distribution: Virginia, USA.

S. dudichi Soós <$

1. Bristles of head and thorax light (brownish-yellow).

2. Ocellar triangle light, brownish-yellow.

3. Cheeks extremely narrow, about V Ü - V I O of height of eye.

4. Buccal hairs present. 5. Tarsal joints of fore legs yellow. 6. Distance between two cross veins

of wing two and a half times greater than length of posterior cross vein.

7. Scutellum wi th 2 pairs of lateral bristles.

8. Distribution: Costa-Rica.

Sobarocephala sexvittata sp. n.

9 — Basic color yellow, but thorax and abdomen ornamented wi th black pattern. Head yellow of various hues, merely ocellar triangle and densely plumate arista black. Upper portion of occiput, greater lower half of frons and face greenish-yellow; an tenná i joints (except for darker portion around aristal base), mouth-parts, palpi pale yellow; facials, cheeks, postgenae, and lower portion of occiput dir ty whitish-yellow. Facials and postgenae argentately, sericeously pruinose. Cephalic bristles yellow. Notum yellow, ornamented wi th 3 pairs of dark brown­ish-black design elements : one quadrangular spot each immediately anteriorad of transversal suture, on both sides of median line; a short black stripe each, extending anteriorad from base of wings, and obliquely toward median line, interrupted immediately in front of supraalar bristles; and a wider, longitudinal stripe each, externally of row of dorsocentral bristles, extending from behind transversal line onto margin of scutellum and terminating before subapical bristle of this latter one. Pleurae entirely unicolorous yellow; mediotergite ( =metanotum), however, uniform brownish-black. Scutellar margins dark brownish-black, w i th a rather wide and quite light yellow (nearly white) longi­tudinal stripe medially. Legs yellow, but tarsal joint of fore leg black; also a dark ring on proximal end of tibiae of each hind leg. Wing transparent, very weakly brownish-yellow, deeper only in apical fourth. Haltères yellow. Yellow pattern of abdomen as: tergite 1 unicolorous yellow, tergites2 and 3 wi th a wide, dark, longitudinal stripe medially, tergites 4 and 6 wholly dark, brownish-black, but tergite 5 entirety yellow.

Head (Fig. 2 : A) about one fourth higher than long, and three fifths wider than high. Frons slightly tapering posteriorad, as long as wide on its anterior

margin; measured at its narrowest point, only insignificantly wider than width of eye. Frons concave, middle of face bluntly cristate. Wid th of cheeks one f i f th to one sixth of height of eye. Postgenae widening posteriorad. Eyes transversally oval. Postvertical bristles well developed, th in yet relatively long, ocellar bristles absent, that is, substituted by a vestigial hair. Both pairs of vertical bristles well developed, exteriors one th i rd shorter than interior ones. Of 12—15 occip­i ta l hairs, upper 5—6 ascendant, others straight and reclinate; upper 3 of both former and latter ones considerably stronger and longer than others. A l l three pairs of fronto-orbital pairs of bristles about equally long, distance between two reclinate ones three times greater than that between inclinate and first reclinate bristles. Vibrissa strong but relatively short, less than half length of arista, almost straightly proclinate wi th only their apical section slightly ascend­ant and strongly inclinate. Four, about equally strong buccal hairs behind vib­rissae. Two genal hairs arising on postero-inferior part of postgenae. Third an­tennái joint oval. Arista densely plumose, hairs about twice longer than its basal diameter.

Notum covered wi th evenly short, fine, erect, l ight hairs. Except for meso-and sternopleurae, covered wi th sparse hairs, pleurae glabrous. Of two pairs of posteriorly situated dorsocentral bristles, anterior one only about one fourth shorter than posterior one. Prescutellars weakly developed, but well discernible. Only two pairs of scutellar bristles present. Subapical pair strong, slightly arcuate and hardly convergent, lateral pair considerably thinner but relatively long, two thirds as long as apicals (merely half as long on Paratype specimen!). Dorsal preapical bristles on tibiae of middle legs strong, well developed. Wing three times longer than wide. Ratio of penultimate and ultimate sections of vein m as 1 : 4.5. Distance between two cross veins nearly twice greater than length of posterior cross vein. Marginal hairs of abdomen at least twice longer than other hairs covering segments.

cf unknown.

A B Fig 2. A = Sobarocephala sexvittata sp. n., head laterally; B = Sobarocephala macalpinei sp. n.

head laterally

D i m e n s i o n s : length of body : 3.5 mm; length of thorax: 1.4 mm; length of wing: 3.0 mm.

D i s t r i b u t i o n : Rio de Janeiro, Distr. Federal, Braz i , Apr. 1938, Ser-vico Febre Amarela (Holotype Ç); Rio de Janeiro, Dist. Federal, Brazil, Apr. 1938, Servico Febre Amarela (Paratype 9)-

L o c a t i o n o f t y p e s : Holotype in the United States National Museum, Washington; Paratype in the Zoological Department of the Hungarian Natural History Museum, Budapest.

The species belongs to those wi th a black-yellow scutellum, being closely allied to S. columbiensis Soós, 1962. The distinguishing features of the two species are as follows:

S. sexvittata sp. n. 6*

1. Tarsal joints of fore legs black, proxi­mal ends of each tibiae of hind legs wi th dark ring.

2. Notum ornamented wi th 3 pairs of dark spots, resp. stripes.

3. Only 2 pairs of scutellar bristles. 4. Light color predominating over

dark pattern on abdomen. 5. Distribution: Brazil.

5. columbiensis Soós, <?

1. Legs unicolorous whitish-yellow, resp. yellow.

2. Notum with 1 pair of dark spots in front of alar bases.

3. 3 pairs of scutellar bristles. 4. Dark color predominating over

light pattern on abdomen. 5 Distribution : Colombia.

Sobarocephala maealpinei sp. n.

9 — Basic color yellow, all bristles light brownish-yellow. Head and antennae preponderantly light yellow. Posterior two th i rd of frons slightly greenish-yellow, mouth-parts and palpi light reddish-brown, a brown stripe each, from below antennái base on face, extending through angle of cheeks, framing also cheeks from below. Ocellar spot and densely plumose arista black. No dark spot around aristal base on th i rd joint . Yellow notum ornamented by 3 pairs of black pattern : 1 pair of trapezoidal spot on both sides, from humeral callus toward median line and before transversal suture, each spot subtended basally by transversal suture; 1 pair of slightly curved, wider, longitudinal stripes externally of row of dorsocentral bristles, extending from behind trans­versal suture to scutellum, expanding there into an irregular blotch; 1 pair of large, triangular spots in front and above base of wings, wi th their apex on notopleural suture,'and basally parallel wi th former longitudinal stripe. Majority of pleurae shiny, black, but pro- and hypopleurae almost completely covered by a brown blotch leaving only pleural margins free (yellow). Prosternum black. Major portion of scutellum shiny black, w i th a rather broad longitudinal stripe medially. Mediotergite and pleurotergites deep brownish-black. Fore coxa black, middle and hind coxae yellow, but middle coxae also wi th a l ight brown spot above. Fore femora yellowish-brown, middle and hind femora black, basally, however, yellow. Fore tibiae completely black, but major basal section of middle and hind tibiae black, otherwise(apically) yellow. Tarsal joints of all legs yellow, merely last three tarsal joints of fore legs darker. Wings brownish, w i th a distinct dark spot apically; also surroundings of posterior cross vein darker. A slit-like light "window" each in cells R3 and R5 wi th in darker apical blotch. Hal tères light yellow. Abdomen yellow, but tergites 4 and 6 black, and tergites 2, 3 wi th a dark spot each medially. Sternites 1—4 and 6 deep brownish-black, but lateral margins of former ones more or less yellowish. Ovipositor yellow.

Head (Fig. 2 : B) about one th i rd higher than long, and about one fourth wider than high. Frons narrowing posteriorad, as long as wide on its anterior margin; wider also at its narrowest point than width of eyes. Frons concave, face slightly convex, wi th a slight crest medially. Wid th of cheeks about one fifth of height of eye. Eyes oval. Postvertical bristles well developed, but ocel­lar ones quite vestigial, discernible only by a high magnification. Inner and outer vertical bristles strong, exterior ones only slightly shorter than interiors. Upper half of 13—15 occipital hairs short, th in , ascendant, lower half strong, straight and reclinate. Fronto-orbital bristles about equally strong. Distance between first inclinate and first reclinate fronto-orbitals only one th i rd of that between two reclinate ones. Vibrissae relatively short, slightly ascendant and rather inclinate, shorter than half length of arista. Five to six buccal hairs behind vibrissae. A long, straight bristle dorsally on apex of second an tenná i joint . Third an tennái jo int elliptical, slightly longer than wide; hairs of densely plumate arista about twice longer than its basal diameter.

Notum covered wi th evenly spaced, dense, recumbent, short and light hairs. Anterior one of two pairs of posteriorly situated dorsocentral bristles considerably thinner than, and only half as long as, posterior one. Well developed prescutellars as long as anterior dorsocentrals. Pleurae shiny, glabrous, but meso-and sternopleurae wi th sparse, short hairs. Preapical pair of bristles of strongly convex and shiny scutellum strong, hardly curved and slightly divergent. One pair of lateral bristles well developed, strong, half as long as subapical pair. Dorsal preapical bristles of middle tibiae well developed, but vestigial on fore and hind tibiae. Wing two and a half times longer than wide. Ratio of penultimate and ultimate sections of vein m as 1 : 4.5. Distance between two cross veins one and a half times greater than length of posterior cross vein. Marginal bristles of abdomen strong, considerably longer than other abdominal hairs. Long, exclinate hairs arising on lateral margins of second tergite.

çf unknown. D i m e n s i o n s : length of body: 5.2—5.7 m m ; length of thorax: 1.9—2.0

mm, length of wing: 3.9—4.1 mm. D i s t r i b u t i o n : Terezopolis, Rio de Janeiro, Brazil, Apr. 1938, Servico

Febre Amarela, M. E. S. Bras. (Holotype, 9 ) ; Terezopolis, Rio de Janeiro, Brazil, Apr. 1938, Servico Febre Amarela, M. E. S. Bras. (Paratype 9 ) ; R i ° de Janeiro, Dist. Federal, Brazil, Apr. 1938, Servico Febre Amarela, M. E. S. Bras. (Paratype 9 ) .

L o c a t i o n o f t y p e s : Holotype and one Paratype in the United States National Museum, Washington; one Paratype in the Zoological Department of the Hungarian Natural History Museum, Budapest.

I dedicate the new species to D R . D A V I D K . M C A L P I N E , my esteemed colleague and distinguished investigator of the Clusiid flies.

The new species belongs to those w i t h a black-yellow scutellum, and is closely allied to S. strigata H E N N I G , 1938. The distinguishing characteristics of the two species are as follows:

S. macalpinei sp. n. ? S. strigata H E N N I G $

1. Two pairs of dorsocentral bristles. 2. A pair of strong prescutellar brist­

les. 3. Lateral pair of scutellar bristles

well developed (half as long as subapical pair).

1. One pair of dorsocentral bristles. 2. No prescutellar bristles.

3. Lateral pair of scutellar bristles short (at most one thi rd as long as subapicals).

References: 1, H E N N I G , W.: Beiträge zur Kenntnis der Clusiiden und ihres Kopulationsapparates (Dipt. Acalypt.) (Encycl. ent. Paris, Sér. B . I I , Diptera 9, 1938, p. 121—138). — 2. Soós, Á.: New Species of Sobarocephala Czerny (Diptera: Clusiidae) (Ann. Hist.-nat. Mus. Nat. Hung., 54, 1962, p. 383—392). — 3. Soós, Á.: Identification Key to the Species of the "plumata-group" of the Genus Sobaroce­phala Czerny (Diptera: Clusiidae)(Acta Zool. Hung., 9, 1963, p. 391—396).

4. Cheeks without brown spot below eyes.

5. Prosternum and fore coxae black. 6. Al l femora black. 7. Pleurae preponderantly black.

8. Abdomen yellow, with a black pattern.

£>. Distribution: Brazil.

4. Cheeks with brown spot below eyes.

5. Prosternum and fore coxae yellow. 6. A l l femora yellow. 7. Pleurae yellow, with a dark stripe

only from notopleura to middle coxae. 8. Abdomen unicolorous black, only

basal and caudal apices yellow. 9. Distribution : Peru.