OF ARTS AND SCIENCES, 65 



5. In Stage III. the dorsal tubercles of 2d and 3d thoracic segments 

 showy coral-red. The subdorsal and infraspiracular tubercles 

 tipped with pale blue ; in Stage II. the same tubercles are almost 

 entirely pale blue. 



G. The head becomes green in stage IV., with a black spot on the 

 side. 



7. The larva is most gaudily colored and conspicuous in the last two 

 stages ; while in S. cynthia there are not so marked differences be- 

 tween the different stages, though the last is the most variegated 

 owing to the beautiful turquoise-blue trappings. 



Note ox the Freshly Hatched Larva of Platysamia 



Gloverii. 



Young Larva, just hatched. — May 15. Just as it slips out of the 

 egg the body and head are jet-black, but the spines are white, though 

 their tips at the origin of the hairs are black. In a few moments, 

 however, the spines turn jet-black ; the hairs arising from them being 

 white. 



Note on a Young Platysamia Larva from Arizona. 



I have had an opportunity, given me by Dr. Riley, of examining 

 several freshly hatched larvae from Arizona, in the collection of the 

 U. S. National Museum (No. 3053, box 13.75), They seem to be 

 congeneric with P. cecropia, but differ in the following respects. 

 Head black, body darker, the spines dark towards the end. The 

 spines are of the same general shape, but the trunks area little shorter 

 and thicker, more stumpy, while the bristles arising from them are a 

 little longer. 



As Platysamia polyommata Tepper is the only species from " South- 

 ern Arizona," it is perhaps the young of this form, but more likely is 

 P. gloverii, as I possess the mature larva of this species collected by 

 the Wheeler Survey party on the Sierra Amarilla in New Mexico. 

 It only differs from another fully fed larva of this species from Salt 

 Lake City in having all the spines slightly slenderer. 



The Life History of Callosamia promethea (Drury). 



The larvae are at first gregarious, feeding side by side on the under 

 side of the leaf. 



P^gg- — Oval-cylindrical, somewhat flattened ; the surface pure 

 white, somewhat shining. Under a half-iuch objective the shell at first 



VOL. XXVIII. (n. S. XX.) 6 



