LEPIDOPTERA. 



129 



aequalibus sericeis vestito, vel setis laxis reflexis consperso ; articulo ultimo ovato vel subcylindrico, 

 obtuso, sericeo vel nudo, omnino recondito; nunc breviter exserto. 



Proboscis longus, validus, spiralis. 



Caput breve, villis crebris obsitum, penicillo intermedio porrectiore. Oculi mediocres nudi, vix 

 puberuli. Thorax dilatatus. {Abdomen maris, articulo ultimo acuto, subtiis unco tenui incurvato ; 

 valvis magnis, attenuatis, aduncis. Swainson's Zool.^ Ulust. I.) Alee largae ; anticse oblongas 

 vel elongato-trigonffi ; posticae rotundatae, sulco abdomen recipiendo concolore: areola discoidali 

 singularum clausa. Pedes graciles, elongati ; antici in utroque sexu conformes ; tarsi singulo- 

 rum articulis quinque, basilar! elongato, reliquis subaequalibus, ultimo unguibus duobus, latera- 

 libus, bifidis, brevibus, arcuatis, acutis, pulvilloque intermedio munito. 



The genus Colias, as at present limited in our systems, comprises two sections, which differ both in the 

 perfect insect and the metamorphosis. In the former the antennae are gradually and uniformly thickened 

 towards the tip ; the palpi are covered with short delicate bristles or scales of uniform length and disposition, 

 and the third joint is somewhat lengthened and attenuated ; in the latter the antennas are filiform at the 

 base and swelled at the extremities into a perceptible club of a lengthened-ovate or obconic form, occupying 

 about one-third of the organ ; the covering of the palpi is less regular ; lengthened, straggling haii"s are 

 mixed with the villi and scales, and the third joint is small, round, and obtuse. The first is perhaps exclu- 

 sively a tropical form. The metamorphosis is exhibited in the sixth figure of our fourth plate, and Co/ias 

 Scylla of the following catalogue may be adduced as typical of the perfect insect. The antennae and palpi 

 are beautifully illustrated in the fifth plate of Mr. Swainson's Zoological Illustrations. The latter appears to 

 belong to northern climates, and I refer to the 242d plate of Mr. Curtis's British Entomology, for the 

 peculiarities of this subdivision as far as regards the antennae and palpi. 



In offering these remarks I have much pleasure in repeating the acknowledgment of the assistance received 

 from Mr. Swainson, more particularly in the arrangement of this genus ; and I trust I shall have his sanction 

 in applying to the second great division of the genus Colias, as a subgeneric distinction, the name of EuRY- 

 Mus, by which he designated this form about eight years ago in my private collection, and which I have 

 jireserved in manuscript. The propriety of this separation appears further from the peculiarities of the 

 larva of Colias Hyale ; and we are greatly indebted to Mr, Curtis for the copy of it exhibited in his 24<2d 

 plate from Hiibner. Whoever will compare this with the larva of true Colias, as exhibited in our fourth 

 plate, will notice the gradual approach to the form of Pontia, which is confirmed by the perfect insect. 



* Larva utringui attenuata, punctis elevatis minutis tenuiter annulata : antenncB e basi 

 ad apicem sensim incrassatce : palpi villis squamisque brevibus, teneris, aequalibus 

 obtecU, articulo ultimo ovato attenuato, nonnunquam subelongato. 

 Colias stride sic dicta. 



53. Colias Pykanthe. Alts alba, supra maris limbis exteriore et posteriore anticarum, foemina* 

 limbo posteriore communi nigris ; antica insuper notd discoidali nigra, in mare lineari trans- 

 versa minutd in fcemina orbiculari insigni : subtiis cinereo-undulatce, puncto discoidali singu- 

 larum argenteo iride lilacind cincto. (Exp. alar. 2 unc. 3 lin. — 3 unc.) 



Wings white above ; in the male, fore-wings with exterior and posterior borders, in the female, 

 both pairs with a common posterior border black ; anterior wings with a discoidal mark, 

 which is linear, transverse and minute in the male, large and oval in the female : under- 

 neath with numerous, close, transverse, cinereous undulations, and on each wing a minute, 

 argentine discoidal spot, surrounded by an irregular iris of a lilach tint. 



s Papilio 



