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yellowish tufts on the back, etc.," and with coral red retractile 

 warts just back of these tufts. I need not give his full descrip- 

 tion, but only add that he said the caterpillars are found on rose 

 bushes, apple and other trees and shrubs in July and August. 

 Not knowing whether these belonged to a new species or to some 

 variety, I watched for some eggs in order to experiment a little. 

 I found some on an apple tree finally, and put them in a box, so 

 that I could watch them from the time of their hatching. The 

 eggs hatched out May 8, 1878. The larvae were very dark-colored, 

 head almost black, and showed some of the distinctive character- 

 istics of this genus. They became lighter-colored after moulting. 

 Nothing peculiar otherwise was noticed till June 14, when some 

 of them moulted, and came out with wJiite tufts on the back. 

 Some of them pupated June 18, some June 19, but as they kept 

 under the leaves during the latter part of their feeding, some 

 might have retained the yellow tufts to the last, but some pupated 

 while having the tufts white. My other duties prevented my 

 watching them as closely as I desired, and I cannot say positively 

 as to the number of times they moulted, but think it was five. 



July 3 some moths made their appearance, both male and 

 female, and as I wished for more fertile eggs to experiment 

 further, I left them in the box. July 16 these eggs hatched, and 

 the caterpillars obtained did not differ from those above referred 

 to. Up to August 7 they had all lost the yellow tufts, except 

 one, and that I put in a box by itself to see if sex had anything 

 to do with the differences in color. One pupated August 14, and 

 others the next day and the day following. August 15 the larva 

 put by itself came out with white tufts, and pupated the 20th. 



September 2 I found some of these caterpillars with yellow 

 tufts on a rose bush and put them by themselves. By the next 

 morning one of them had pupated and the others moulted during 

 the day and gave me an opportunity to witness the operation. 

 The caterpillar fastened its tail to the box cover, and in a short 

 time the portion of the skin covering the head separated from 

 the rest, and was soon detached by the head being curved under 

 the body and rubbed on the box cover. The remainder split 

 along the under side, and the caterpillar working its body back 

 and forth, and from side to side, soon freed itself and came out 

 with white tufts in place of the yellow ones it had previous to 

 moulting. It seemed very much exhausted after the process. 

 Some of the larvse referred to August 7 changed back to yellow, 

 and pupated in that coudition, coming out September 5. The 

 one that pupated August 20 produced a female. Of the brood 

 now under consideration about one male to every five females was 

 produced, but in the earlier brood the proportion of males was 

 larger. Nothing had been proved thus far as to whether sex had 

 anything to do with the color of the tufts or other changes in the 

 color, though at one time I thought I should be able to prove 



