March — April 1S90. 



PSYCHE. 



325 



THE PARTIAL LIFE-HISTORY OF PSEUDOHAZIS EGLANTERINA, 

 WITH REMARKS ON THE LARVAE OF ALLIED GENERA. 



BY ALPHEUS SPRING PACKARD, PROVIDENCE, R. I. 



I am indebted to Prof. C. V. Riley 

 for the opportunity of examining the 

 lan'ae in alcohol of the first stage of this 

 species, which were collected at Mani- 

 tou. Col. I have carefully compared 

 these with freshly hatched larvae of Hy- 

 per chifia io. When first hatched the 

 form of the head and shape of the body 

 are as in H. io> but the larva is some- 

 what larger. The generic differences 

 from H. io are confined, not to the 

 number and arrangement of the spini- 

 ferous warts, but to the shape of the 

 spines themselves, and this makes it evi- 

 dent that in probably all the genera and 

 species of the heinileticini of Grote, the 

 spines themselves are especially devel- 

 oped at first with reference to the pro- 

 tection of the young larvae, which 

 huddle together in masses so that their 

 bodies are protected from observation. 

 Later in life the spines are smaller in 

 proportion to the body because more 

 scattered, and then it is that the larvae 

 are protected by the poisonous nature of 

 the spines, the body itself being more 

 uncovered and conspicuous. It is just 

 the reverse of what takes place in the 

 arctians and other larvae which become 

 very hairy or bristly late in larval life, 

 and are sparsely provided with hairs 

 when first hatched. It will also be seen 

 that in respect to the spines the present 



species when first hatched is much more 

 highly specialized than H. io., the latter 

 being more simple and generalized a 

 form as regards the spiniferous warts. 



Stage I . — Length 5 mm. The spini- 

 ferous tubercles are arranged, as in H. io 

 in eight rows, those of the two rows, 

 one on each side of the median line of the 

 body, and the subdorsal ones being the 

 larger and longer, while those on the side 

 of the body become shorter and smallei 

 as they approach the under side of the 

 body. The spine-bearing warts are 

 larger and swollen compared with those 

 of H. io. The dorsal spines on the pro- 

 thoracic segment* difter from those of 

 H. io in having the trunk spinulated, 

 the spinules being long and each bear- 

 ing a long, tapering hair ; the main 

 spine is pale but ends in two long black 

 forks, each tine of which is 2-3 as long 

 as the trunk of the spine itself, while 

 the bristle arising from each fork is as 

 long as the latter. The spines of the 

 two lower rows are spinulate on the 

 trunk but are pale throughout, while 

 the larger ones on the back are dark at 

 the end, being pale at the base. The 

 dorsal spines on the abdominal segments 



* In describing caterpillars it is well, especially in 

 those of bombyces, to distinguish the three first seg- 

 ments behind the head as the thoracic; the ten succeed- 

 ing ones as the abdominal segments. 



