new amber (hemiptera)downloads.hindawi.com/journals/psyche/1941/072496.pdf · 2019-08-01 · 1941]...

1941] Amber Aradidae 95

TWO NEW SPECIES OF ARADID.ZE FROM BALTICAMBER (HEMIPTERA)

BY ROBERT L. USINGER

University of California, Davis

A considerable collection of Hemiptera from Baltic Amberwas received some time ago through the kindness of Prof.F. M. Carpenter. Of this material the aphids were exam-ined by Prof. E. O. Essig, the scale insects by Prof. G. F.Ferris, and a beautifully preserved Tingitid by Dr. C. J.Drake. Two well preserved Aradids are. treated in thepresent paper while the remaining specimens, mostly Ful-gorids, Cicadellids, and Mirids, are as yet unstudied.

Only three species o Aradide, e.g. Aradus supiestes,assimilis and consimilis, and one Aradid nymph were re-corded from Baltic Amber by Germar and Berendt. Al-though specimens of these species have not been examined,the descriptions and figures clearly indicate that they con-form to our present day definition of the nearly cosmopolitanthough presumably originally holarctic genus Aradus. Thepresent material is of more than usual interest in that thetwo species are the first representatives of their respectivetribes in Baltic Amber. Moreover, the Ca.lisius is the firstrepresentative of its tribe to be recorded from the ossilrecord.

Calisius balticus Usinger, new species

Oblong-ovate with sides subparallel, head transverse andantennm relatively long.Head one-eighth shorter than broad, 21 :24; tylus slightly

dilated at about middle, scarcely surpassing level of apicesof second antennal segments; antenniferous tubercles short,

1Germar, E. F. and G. C. Berendt. Die im Bernst.ein befindlichenHemipteren und Orthopteren der Vorwelt. In Berendt, G. C. Die imBernstein befindlichen ovganischen Reste der Vorwelt. Berlin. BandII, Abth. I. pp. 22-23, Tab. II, figs.. 11-13, Tab. III, fig. 17. 1856.

96 Psyche [)une-Sept.

reaching about to level of basal third of second antennalsegment, divergent and blunt; postocular tubercles distinctbut not reaching so far as outer margins of eyes; uppersurface eebly elevated with granular areas in ront o andbehind .eyes and with two moderately elevated, anteriorlydivergent longitudinal rows o2 about our large granuleseach at middle of vertex; eyes small, less than half as wideas interocular space, 5" :13. Antenntv equal in length tohead, the proportion of segments one to our as 3:5:5:8;first and third segments cylindrical, second roundly clavate,ourth usiorm. Pronotum just twice as broad acrosshumeri as long on median line, one-seventh shorter thanhead, 18" :21; disk moderately convex with a distinct trans-verse impression at middle interrupting the our distinct,posteriorly divergent longitudinal carinm; subparallelmedian carine produced forward slightly beyond base ofhead; lateral margins nearly straight but for the deep notchat transverse impression, roundly lobed. Scuellum a littleless than three times as long as pronotum, 51"’18, and abouthalf as broad as long; broadest at base where it is somewhatless than two-thirds as broad as long, 28"’51, then with thesides concavely sinuate to narrowest point just behind middlewhere it is distinctly less than half as broad as long, 24"51,widening posteriorly to about half as wide as long and thenrounded to broadly rectilinear apex; depressed portion ofdisk evenly punctate; longitudinal carina well elevated, im-punctate; lateral carinm coarsely granular, almost roundlytuberculate basally; four anteriorly directed projections ofbasal elevation but feebly developed. Abdomen only mod-erately dilated, about four-fifths as wide as pronotum,35"43; connexival surface finely granular, the lateral mar-gins of segments each with three feebly developed, roundedtubercles.

Size, male, length 2.5 mm., width (pronotum) .87 mm.,(abdomen) 1.07 mm.Holotype: No.. 4634 (male), Museum of Comparative

Zoology, Harvard University; in Haren collection of Balticamber insects.

Closest to the European ghilianii (Costa) but smallerthan that species with broader head, less prominent tuber-cles on head, pronotum, and base of scutellum, and entirely


distinct antennm. The antennae of a f.emale specimen ofghilianii, determined by Montandon and kindly loaned orcomparison by Mr. W. E. China of the British Museum(Natural History), are much shorter than the head, 19: :26,with the proportional length of segments one to our as4:4:4:7.The species o2 Calisius, due to their obscure habits and

small size, have escaped the notice of most general collectorsand hence are very imperfectly known. Most of the tw.enty-one species were described by Bergroth e, or by Horvathin his excellent monograph o the old world species. Costa,Stal, Champion, Kirkaldy, and Schouteden have likewiseadded species and three as yet undescribed species are be-fore me rom islands of the south Pacific.

Occasional records 2rom widespread localities throughoutthe world suggest that the tribe Calisiini is very widespreadand may even prove to be tropicopolitan, though no specieshave yet been recorded rom the great Oriental Realm. WithNew Guinea (4 species) as a possible center, somewhat lessthan half of the species known to me radiate southward toAustralia and Tasmania, eastward to Fiji and the islandsof central and southeastern Polynesia, and northward toMicronesia. All of these species, as well as the two Euro-pean species, ghilianii and salicis, are similar in body ormand lack the prominent black granules at the apex of th.esautellum and on the sides of the scutellum near the middlewhich are characteristic of the American species.The discovery of an Oligocene species which is clearly

congeneric though falling in a separate group, as used above,with greatly reduced connexival and other granules, a verybroad head, and uniformly dull and immaculate colorationindicates great age and relative stability or the group. Awarmer climate and probably different limits of tolerancedoubtless permitted Calisius balticus to survive so ar north

2Bergroth, E. Notes on American Hemiptera. II. Canadian Ent.,45 1-8, 1913.

8Bergroth, E. A New Species of Calisius. Canadian Ent., 45:9,1913.4Horvath, G. Species mundi antiqui generis Calisius. Ann. Mus.

Nat. Hungarici, 11:623-634, 10 figs., 1913.

98 Psyche [June-Sept.

for neither ghilianii nor salicis extends today beyond middleEurope.

Mezira succinica Usinger, new speciesFigur.e 1

A relatively large species with broad depressed head,flattened and anteriorly dilated paraclypeal lobes reachinglevel of apex of first antennal segment, strongly producedpostocular tubercles distinctly surpassing outer margins ofeyes, moderately anteriorly produced and broadly roundedanterolateral pronotal angles, and strongly convex male geni-tal capsule which exceeds lobes of basal genital segment.Surface in great part coarsely granular.

Figure 1. Mezira succinica n.sp. Photograph of holotype. A, x 8;B, x4.

Male. Head broadest across postocular tubercles, trans-verse, the ratio of width to length as 6" "5; anterior portionof head beyond insertion of antennm almost as long as


basal portion of head, 21::25, the tylus reaching slightlybeyond its middle with the lateral lobes contiguous beyondit, subflattened, and dilated apically; antenni2erous tuber-cles, measured from base of cleft in which the antennae areinserted, two-thirds as long as first antennal segment and,though .strongly produced, rather blunt at apices; postoculartubercles strongly produced, exceeding outer margins oeyes by a distance nearly equal to exposed width of an eye,41/ :6 disk apparently concave, though elevated along tylusand middle of base, because of elevated sides including eyesand postocular and antenni2erous tubercles and especiallybecause o strongly elevated lateral plates which cover innerportions o ,each eye. Antennx stout, the greatest thicknessof first segment about equal to that o2 apex of ront emurshort, the total length scarcely more than one-sixth longerthan greatest width of head, 73"’60; proportion of seg-ments one to 2our as 19"18"17"19; first segment reachinglevel of apex of head. Rostrum obscured but not exceedingbase of head. Pronotum transverse, being a little over twiceas broad as long, 104: :49; subequal to head on median line;posterior margin distinctly concave in front of scutellum;anterior margin likewise distinctly concave so that the pro-notum is actually two-sevenths longer laterally than atmiddle; sides sinuately narrowed and distinctly elevated inront of broadest posterior ourth; antero-lateral anglesextending to lewel o basal fith of head, broadly, evenlyrounded; disk depressed on anterior lobe between four ele-vated callosities and within ,elevated lateral margins. Scu-tellum about as long as pronotum on median line, its diskscarcely elevated basally, surrounded by abruptly elevatedcarinm broken only narrowly at apex and with a distinctlongitudinal carina at middle which does not reach to apex;shape subtriangular, the base slightly arcuate and sidesevenly narrowed to apical fourth and then briefly subparallelto rounded apex. Hemelytra reaching nearly to base of geni-tal capsule, strongly narrowed posteriorly when at rest, thetransverse width at level of apices of coria only half thewidth of abdomen at this point; basal third of corium onlymoderately dilated and feebly arcuate, the distance acrossdilated bases of coria only slightly greater than greatestwidth of pronotum, 109"’104, outer margin of corium

100 Psyche [June-Sept.

beyond this concave to subangular apex; apical marginfeebly, evenly arcuate. Connexivum unlike the rest of dorsalsurface, apparently coarsely punctate. Abdomen graduallywidening to the briefly flaring posterior lateral margins offourth visible segment at which point it is almost one-fourthwider than greatest width of pronotum, 125" :104, the mar-gins of fifth segment concave but posteriorly convergent andmargins of sixth gradually rounded. Lobes of sixth ab-dominal segment reaching apical eighth of greatly enlargedand obscured terminal segment. Under surface almost en-tirely clouded by a while film but with the abdominal venterevidently evenly and relatively finely granulate-punctate.Legs short, the femora strongly incrassate at middle. Colorof entire body apparently rather uniform dark brown.

Size, length 7.45 mm., width (pronotum) 2.6 mm. (abdo-men) 3.2 mm.

Holotype: No. 4635 (male), Museum of ComparativeZoology, Harvard University; in Haren collection of Balticamber insects.

Closely allied to the widespread European Mezira tremule(Germar) which occurs along the shores of the Baltic to-day. However, the antennm are shorter and stouter, theparaclypeal lobes are broader and more dilated anteriorly,/he antero-lateral pronotal angles are more produced an-teriorly and are broadly rounded and the size is smaller thanin tremultv.

5Schumacher, F. Mezira tremult (Germar), ein Naturdenkmal ausdem Urwalde von Bialowies in Polen. Deutsch. Ent.. Zeit., 1919:285-288, 3 figs., 1 map. 1919.

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