CEdematophorus cretidactylus and Lioptilus Homodac- 

 tylus have both been reared from the foliage of Eupatoi-ium picrptir- 

 eum. Early in June, 1880, I found the gregarious larva; spinning to- 

 gether the leaves of the plant which grows plentifully on waste low 

 lands near the city. The same bundle of leaves which usually in- 

 cluded the terminal bud, often contained several of the woolly cater- 

 pillars of different sizes, e. g. from .1 to .3 of an inch long. The 

 largest ones, however, were, as a rule, found feeding singly on the 

 unfastened older leaves; it appears that the young larvae remain in 

 company on the tender leaves until of considerable size when they 

 scatter. It was observed that some of the larger ones were of darker 

 color than others; this was supposed to be a mere color variation, 

 no other differences being noted. They are quite unlike the active 

 larva? of the thistle plume, for they are sluggish, nor do they de- 

 stroy the growth of the stem of their food-plant. They appear to 

 depend for protection upon their resemblance to the being, roughish, 

 woolly surface on which they rest. So far, no parasite has been ob- 

 served destroying them. By the middle of June they began to 

 transform, the larger ones giving darker pupa? than the lighter ones, 

 no other special difference noted. June 27th the moths began to 

 appear. The dark pupae giving moths very different from the lighter 

 ones, and yet with the foregoing facts in mind it was difficult to 

 conclude that the moths were not varieties of one species instead of 

 distinct species, and as it proves of different genera. Both sorts 

 were sent to Professor Chas. Fish, Brunswick, Maine, who deter- 

 mined them as above. He also sent them to Lord Walsingham who 

 confirmed the determination. 



During the past summer I again noted the occurrence, etc., of 

 the same, and give here the facts from my notes, made at the time. 

 The larvae first seen May 30th; the smaller ones were all among the 

 young, woolly leaves, the larger on the more advanced leaves. There 

 were at this date three sizes, respectively .12, .25 and .34 of an inch 

 in length. The first sort were white, attenuated both anteriorly and 

 posteriorly; the hairs arising from the tubercles are not spinulose, 

 at least not seen to be so under a half inch objective with the middle 

 eye-piece, hairs of unequal length, all white; those from the first 

 ring do not arise from tubercles, they hang over the head but slightly 

 or not at all. The first thoracic ring is nearly twice the width of 



