30 Journal New York Entomological Society. [Vol. vi. 



tened a few silky threads over itself, a labor which was completed the 

 following day, and passed into the pupal stage, having passed a larval 

 period of, approximately, sixty-one days, and seventy-four days from 

 time of deposition of the egg. 



The remaining two of the three larger larvae crawled down to the 

 bottom of the breeding cage and began constructing their cocoons, but 

 died before pupating. The imago of larva No. i, issued January 13, 

 1897, thus giving a pupal period of thirty-five days, and one hundred 

 and nine days from date of oviposition. 



Of the series of three smaller larvae, after December 4, two of them 

 increased in size very rapidly, and, in fact, seemed to be gaining upon 

 those of the first series, while the third, which, so far as could be de- 

 termined, had continued to be the smaller since the time of measure- 

 ment on November 19, did not increase in size so rapidly. While the 

 two just mentioned became slightly lighter in color, precisely as had the 

 three larger ones, this one continued to be much smaller and darker in 

 color, the blackish stripes being quite conspicuous. 



The first larva of the three smaller ones to pupate will be designated 

 as No. 2, the moth and cocoon beeing so numbered in the accompany- 

 ing illustration. This was one of the two light colored larvae of this 

 series, and began fastening the blades of grass together on the night of 

 December 8, the imago issuing January 19, 1897, after a pupal period 

 of forty-one days, and one hundred and fifteen days from date of ovi- 

 position of the egg. 



The third larva reared to the adult moth will be designated as No. 

 3, including adult and cocoon. This was second of the lighter colored 

 of the second and smaller series, and began pupating during the night 

 of December 9, but did not finish doing so until the following day, leav- 

 ing the blades of grass which it had begun fastening together, with the 

 evident intention of constructing a cocoon therefrom, and appropriated 

 a bit of cotton that happened to be within reach, and constructed its 

 cocoon from that, thus forsaking a natural material for an artificial, and 

 seemingly one of more practical utility. The imago appeared January 

 23, 1897, after a pupal period of forty-four days, and one hundred and 

 seven days from the deposition of the egg. 



The third of this series and the smallest of the larvae studied, 

 escaped from its breeding cage, December 15, evidently when searching 

 about for a satisfactory place in which to spin its cocoon. It continued 

 to be of a darker color throughout, but had attained to the same size as 

 its fellows. Later, an adult of this species was found dead in the insec- 



