134- DESCRIPTIVE CATALOGUE. 



Papilio Scylla. Cram. pi. 12. &g. C. D. Sulz. Ins. edit. Roem. tab. 15. fig. 6. (The male.) 

 Papilio Scylla. Donov. Ind. Ins. (with a figure.) Hospitatur in Mus. D. Banks. 



This species is very uniform in its markings : the sexes are very clearly distinguished on the upper sur- 

 face ; they agree underneath, with this modification, that the marks of the female have a more saturated 

 tint and are more diffuse. Colias Scylla presents no prominent varieties : the description given of it in the 

 Encyclopedic is quite satisfactory, and requires no explanatory details. The male is provided, as in the 

 allied species, with a glandular sac near the base of the hinder wings, and with a corresponding brush-like 

 covering protruded from the inner margin of the fore-wings. The metamorphosis is represented on our 

 fourth plate, fig. 6 ; and 6, a. The larva feeds on various species of Cassia, particularly on the Cassia Jistula 

 and C. obtusifolia, and in this habit, it agrees with the C. Pyranthe, according to Dr. Koenig and with the 

 P. Sennce of Linnaeus figured by Abbot. It is, however, occasionally found on other plants : it is extremely 

 abundant, particularly in the early part of the rainy season, after the renewal of the foliage of these plants. 

 I must, however, remark, that the various species of Colias contained in this catalogue resemble each other 

 so closely in the larva state, that the distinction of species is extremely difficult. The greatest number of 

 specimens obtained by breeding belong to the species now described ; but in examining the series put up in 

 .lava in illustration of the drawings prepared during the progress of this research, I now observe several speci- 

 mens of Colias Jugurlhina and Colias Alcmeone, a circumstance which shows their near resemblance in 

 the larva state. Among these specimens is contained that remarkable variety of Colias Jugurthina, figured by 

 Cramer with the name of Papilio Crocale. 



* * Larva lineari-cylindrica, subtoinentosa : antetiTKB basi ultraque medium filiformes, 

 capitulo elongato-ovato vet obconico : palpi setis villisque longis diffusis hirsuti, articulo 

 ultimo obovato, obtuso. 



Subgenus Eurymus. Swainson. 



Observation. — This form appears to be confined exclusively to extratropical regions ; no individuals 

 belonging to it are contained in our collection. Mr. Swainson gives Colias Hyale as the type of 

 this subgenus, and I refer again to Mr. Curtis's distinct illustration contained in hislxi. No. pi. 

 24(2 : the larva evidently leads to the next modification of form. 



Genus TERIAS. 



Terias. Swainson. Zool. Illust. iv. pi. 22. Papilio. Linn. Fab. &c. Pieris. Latr. 

 Character. Larva lineari-cylindrica, gracilis, utrinque obtusa, obsolete transversim scutata, villis 



brevibus hirta, striga pallida laterali signata : capite parvo, obtuso, obscuro. (Tab. iv. fig. 8.) 

 Chrysalis glabra, recta, subcompressa ; supra carinata, arcuata, utrinque attenuata, mucrone solitario 



definita. (Tab.iv. fig. 8; 8 a.) 

 Imago : AnienncB mediocres, graciles, basi filifoi-mes, apicem versus sensim in clavam, elongato-fusi- 



formem, subcompressam abeuntes. 

 Palpi brevissimi, articulis inferioribus latis, compressis, capiti adnatis, basilari subelongato, squamis 



brevissimis sequalibus arete vestito : articulo secundo paululum breviore, extiis rotundato, undique 



squamulis minutissimis villis interspersis dense obtecto ; tertio minuto, attenuato, nudo, porrecto. 

 Proboscis elongatus, validiusculus. 



Caput breve, nutans, alarum area costali subreconditum ; postice thoracis crista transversa margi- 

 natum. 



