life history of euchaetes ... -...

70 PSUCttE. [May x897.

LIFE HISTORY OF EUCHAETES EGLENENSISPARISON WITH E. COLLARIS.

AND COM-

BY HARRISON G. DYAR NEW YORK.

Egg. Large, rounded conoidal with flatbase, very shining, deep ocher yellow; reti-culations fine, hexagonal, linear and veryobscure; diameter .7 mm., height .6 mm.

Laid in patches of considerable size, theseveral eggs not contiguous.Stage L Body pale yellow, warts large,

black; feet and shields dark; joints 4 to 6reddish, forming a band, as also joint xo, butfainter. On prothorax four setae on theshield and one detached, two on the prespir-acular tubercle, two on the subventral tuber-cle; joints 3 and 4 with three setae from thewart ia-f-ib, one seta from iia, a very fineone from ib, one fi’om iv and two from vi;no subprimary setae on the thorax. On ab-domen two setae from wart i, one fi’om ii,two from iii, one each fi’om iv and v, twofrom the leg plate; the subprimary tuberclevi is present on joints 5, 6, It and t2 butbears no seta; vii and viii present on the ap-odal segments. On joint 3 the subdorsaltubercle (i -f- ii-]- iii) bears only four setae.Lobes of head black, clypeus whitish; width

Stages It-IV. As in the mature larvabut the hair tufts shorter and smaller, onlythe dorsal ones (i-iii) with any plumedhairs, consequently appearing less hairy.The youngest ones are a little greenish.Partly gregarious at first, hanging by athread if disturbed. The habits are much asin 2. egle. Widths of head .7, I, x.5 mmoStage V. Head shining reddish orange,

paler in the sutures, ocelli dusky; width 2

ram. Body orange red a shade paler thanthe head, immaculate. Warts small, neat,black, the hair bunches composed of shortspinulated hairs basally, feathery ones cen-trally, compact, subpencilled, not concealingthe body; short and even, I.5 to 2 mm long,those from warts and ii on joints 3 and 4

longer, on 4,about twice as long, on 3 threetimes as long as on the others. Hair all sor-did silvery gray; leg plates blackish. Tu-bercles to vi normal, iv scarcely smallerthan v four warts on joints 3 and 4 cervicalshield and anal plate reduced, representedeach by four small warts. Joint 2 slightlyretracted, considerably reduced.luckaetes collaris has the same number of

stages and the same widths of head. Theeggs are likewise large, rather hemispherical.In the first stage tubercle is single-hairedthroughout, but otherwise the seae are justthe same, with the curious non-setiferous tu-bercles vi on the apodal segments. Thehead is paler, having only a dusky shade atthe vertex ofeach lobe. In all the subsequentstagez the body is whitish and the head sil-very gray, the hair tufts spreading, not pen-cilled, forming an even smooth coat risingabout 2 mln. above the back,, longer at theends. The warts are concolorous with thebody, not blackish; there are no marks. Inhabit the larvae differ by their tendency toconcealment and are hence less often seen.They feed on the dogbane (Apocynum)while E. egleuensis prefers milk-weed(Aselepias).In previously published accounts of E. col-

laris, Jewett seems to describe four stagesand Edwards implies six, but in neither caseis the number definitely stated.

BUTTERFLY SOUNDS.Carl Frings states(Soc. ent., Mar. t, t897 that when some bredspecimens of Parzass[us a36oilo were dis-turbed, they spread their wings out flat andproduced a distinct (recht laut) noise by aforcible and continued grating of the hindtibiae and tarsi against the basal field of thehind wings, which is rather thickly beset withstiff hairs.

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