PAPILIONID^. 251 



Labrador. It represents our C. Philodice. C. interior lives 

 north of the Great Lakes, and C. ocddentalis ranges from 

 Fort Simpson to the Gulf of Georgia. 



The species of a closely allied genus, Terias {T. Lisa and 

 T. Delia), are much smaller and are more tropical. 



Tlie genus Danais has antennaj with a long and curved knob, 

 the head and thorax are spotted with white, and the wings are 

 round and entire. The caterpillars have projecting, thread-like 

 horns, arranged in pairs on the top of the second and eleventh 

 segments, and the body (D. Archippus) is banded with yellow, 

 black and white. The oval chrysalids are short and thick and 

 decked with golden spots. The larva of D. Archippus Harris 

 feeds on the silk-weed, Asclepias, and matures in about two 

 weeks, changing its skin three times, while the chrysalis state 

 lasts for ten or twelve days. The butterfly appears from July 

 to September. 



A very beautiful and quite aberrant tropical genus is Heli- 

 conia, in which the wings are small, very narrow and often very 

 transparent, while the antennae are nearly as long as the body. 

 The larvae are either long, cylindrical and spinose (Acraea 

 violoe), or furnished with several pairs of long fleshy append- 

 ages, and the chrysalids are often brilliantly spotted with 

 golden and suspended by the tail. 



According to H. W. Bates (Transactions of the Entomolog- 

 ical Society, 1857), the venation of the wing in many species 

 of Meclianitis and Ithomia, which are allied to Heliconia, varies 

 in different individuals of the same species. The sexes have 

 the closest resemblance in color and markings. They are 

 very gregarious in their habits. The Brazilian ''■ H. Melpomone 

 varies in a curious manner. I have no doubt they are hybrids 

 {i. e. the varieties), and I can almost point out the species with 

 which it hybridates. Strange to say, the hjdjrids occur in one 

 district and not in another, and one style of hybrids only occur 

 in one district and not in the others, the species being equally 

 abundant in all the districts." 



Argyanis is readily recognized by the numerous round and 

 triangular silver spots on the under side of the hind wings. 

 The very spiny caterpillars have a round head, and the spines 

 are branched, two of the prothoracic ones being the largest and 



