LEPIDOPTERA. 



129 



*qualibus sericeis vestito, vel .setis laxis reflexis consperso ; articulo ultimo ovato vel subcylindrico 

 obtuso, senceo vel nudo, omniuo recondite ; nunc breviter exserto. 



Proboscis longus, validus, spiralis. 



Caput breve, villis crebris obsitum, penicillo intermedio porrecriore. OcuH mediocre* nudi, vix 

 puberul.. Thorax dilatatus. {Abdomen maris, articulo ultimo acute, subtus unco tenui incurvato ■ 

 va vis magnis, attenuatis, aduncis. Swainson's Zool. Blast. I.) Ate largse; antics oblonge 

 vel elongato-tngon*; posticaa rotundatas, sulco abdomen recipiendo concolore : areola discoidali 

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

 rum articulis qu.nque, basilar! elongate, reliquis subsequalibus, ultimo unguibus duobus, latera- 

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



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

 perfect insect and the metamorphosis. In the former the antenna 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 antenna 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 hairs 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 Colias 

 Scylla of the following catalogue may be adduced as typical of the perfect insect. The antenna? 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 antennas 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 

 preserved 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 242d 

 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 utrinqui attenuata, punctis elevatis minutis tenuiler annulata : antennce e bast 

 ad apicem sensim incrassata : palpi villis squamisque brevibus, teneris, cequalibus 

 obtecti, articulo ultimo ovato attenuato, nonnunquam subelongato. 

 Colias stride sic dicta. 

 53. Colias Pyranthe. Aim alba, supra maris limbis exleriore et posteriore anticarum, fceminae 

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

 versa minutd in fazmina orbicidari insigni : subtus cinereo-undidatce, 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 



