70 



PSJ'CHE. 



LIFE HISTORY OF EUCHAETES EGLENENSIS AND COM- 

 PARISON WITH E. COLLARIS. 



BY HARRISON G. DVAR, XEW YORK. 



Egg. Large, rounded conoidal with Rat 

 base, very shining, deep ocher yellow; reti- 

 culations fine, hexagonal, linear and very 

 obscure; diameter .7 mm., height .6 nun. 

 Laid in patches of considerable size, the 

 several eggs not contiguous. 



Stage I. Body pale yellow, warts large, 

 black; feet and shields dark; joints 4 to 6 

 reddish, forming a band, as also joint 10, but 

 fainter. On prothorax four setae on the 

 shield and one detached, two on the prespir- 

 acular tubercle, two on the subventral tuber- 

 cle; joints 3 and .\ with three setae from the 

 wart ia-|-ib, one seta from iia, a very fine 

 one from ib, one from iv and two from vi ; 

 no subprimary setae on the thorax. On ab- 

 domen two setae from wart i, one from ii, 

 two from iii, one each from iv and v, two 

 from the leg plate ; the subprimary tubercle 

 vi is present on joints 5, 6, 11 and 12 but 

 bears no seta ; vii and viii present on the ap- 

 odal segments. On joint 13 the subdorsal 

 tubercle (i -(- ii + iii) bears only four setae. 

 Lobes of head black, ch-peus whitish ; width 

 .5 mm. 



S/ages Il-IV. As in the mature larva 

 but the hair tufts shorter and smaller, only 

 the dorsal ones (i-iii) with any plumed 

 hairs, consequently appearing less hairy. 

 The youngest ones are a little greenish. 

 Partly gregarious at first, hanging by a 

 thread if disturbed. The habits are much as 

 in B. egle. Widths of head .7, i, 1.5 mm. 



Stage V. Head shining reddish orange, 

 paler in the sutures, ocelli dusky; width 2 

 mm. Body orange red, a shade paler than 

 the head, imm.aculate. Warts small, neat, 

 black, the hair bunches composed of short 

 spinulated hairs basally, feathery ones cen- 

 trally, compact, subpencilled, not concealing 

 the body; short and even, 1.5 to 2 mm long, 

 those from warts i and ii on joints 3 and 4 



longer, on 4 about twice as long, on 3 three 

 times as long as on the others. Hair all sor- 

 did silvery gray; leg plates blackish. Tu- 

 bercles i to vi normal, iv scarcely smaller 

 than v; four warts on joints 3 and 4; cervical 

 shield and anal plate reduced, represented 

 each by four small warts. Joint 2 slightly 

 retracted, considerably reduced. 



RucJiaetes collaris has the same number of 

 stages and the same widths of head. The 

 eggs are likewise large, rather hemispherical. 

 In the first stage tubercle i is single-haired 

 throughout, but otherwise the setae are just 

 the same, with the curious non-setiferous tu- 

 bercles vi on the apodal segments. The 

 head is paler, having only a dusky shade at 

 the vertex of each lobe. In all the subsequent 

 stages tlie body is whitish and the head sil- 

 very gray, the hair tufts spreading, not pen- 

 cilled, forming an even smooth coat rising 

 about 2 mm. above the back, longer at the 

 ends. The warts are concolorous with the 

 body, not blackish ; there are no marks. In 

 habit the larvae differ by their tendency to 

 concealment and are hence less often seen. 

 They feed on the dogbane (Apocynuni) 

 while E. egleiiensh prefers milk-weed 

 (Asclepias). 



In previously published accounts of £. col- 

 laris, Jewett seems to describe four stages 

 and Edwards implies six, but in neither case 

 is the number definitely stated. 



Butterfly Sounds. — Carl Frings states 

 (Soc. ent.. Mar. i, 1S97) that when some bred 

 specimens of Par/iassins apollo were dis- 

 turbed, they spread their wings out fiak and 

 produced a distinct (recht laut) noise by a 

 forcible and continued grating of the hind 

 tibiae and tarsi against the basal field of the 

 hind wings, which is rather thicklv beset witli 

 stift" hairs. 



