15 



also two inferior black spots. Legs light green, prolegs banded 

 with black. L. 30 m. m. 



Mature larva. — Body light bluish-green, whitish above, im- 

 maculate and without any black dorsal tufts. Thickly covered 

 with tufts of long, curved yellowish-white hairs. A few short 

 black hairs on ii and 12. Head large, dirty-whitish, with a few 

 darker mottlings, and two inferior black spots on either side. 

 Stigmata yellow. L. 45. 



Entered the earth September 9, where it spun a slight co- 

 coon, changing to a somewhat slender olive-tinted pupa. Imago 

 June 26, 11.30 A. M. 



The long curved hairs give this larva a very curious appear- 

 ance when at rest on the under side of a leaf, with its body curved 

 about so as to form what appears to be an oval mass of down that is 

 readily mistaken for a nest of spiders' eggs. The curved hairs seem 

 to come to a sort of focus in the region of segment 9, which is 

 very characteristic. Before entering the ground the body be- 

 comes dirty brownish-green, the hairs become dirty yellow, the 

 head entirely black, without marks. Found on poplar and birch. 

 This is the only species of Apatela, as far as I know, the larva of 

 which enters the earth to spin its cocoon. A second specimen, 

 to which no earth was given after it had changed its color pre- 

 liminary to transforming, refused to spin a cocoon with bits of 

 bark and other substances furnished for the purpose, and finally 

 died, as it seems, for lack of earth to enter. This larva resem- 

 bles very closely, in both the stages above described, the corre- 

 sponding stages of the European Apatcla Icporiiia, buc the mature 

 larva of vulpina differs by the absence of any dorsal marks and, 

 probably, in some other points. The pure white color of the 

 imago is, doubtless, protective, and connected with the white color 

 of the bark of its second food plant. 



Apatela noctivaga. Grote. 



Eggs on poplar, July 14. Hatched July 9. Young larva. 

 Color greenish-white. Dorsal portions of segs. J, 4, 7, 8 and 11 

 red; the rest more or less tinged with red. Sparsely clothed 

 with long blackish hairs. Beneath greenish-white. Head brown, 

 rather stout, not tapering. L. 3 m. m. 



After 1st moult, July 12. Color dirty greenish. Segmenta- 

 tion very distinctly marked. Dorsal patches dull reddish on 

 superior portion, the other segments (except 9 and 10) suffused 

 with red. Head dirty red, greenish anteriorly. Somewhat 

 thickly covered with tufts of stout black hairs. L. 5.5 m. m. 



After 2d moult, July 12. Much darker than before, the red 

 colors having become dark wine-color, somevv'hat mottled, and 

 being suffused over the dorsal portion of all the segments, except 

 9 and 10. Sub-lateral and ventral portions light green, except 

 on segs. I. 2 and 3, which are tinged with red. A whitish lateral 

 line. Body covered with black setiferous warts, on which are set 



