132 Annals Entomological Society of America [Vol. XV, 



such a case and the only recorded instances are those reported 

 above from New Jersey and Colorado. 



The egg. — The eggs when first laid are clear ivory-white. 

 They hatch in 9 to 12 days, depending on the temperature. 

 In one lot of eggs closely observed during the 12 days required 

 for incubation, it was noted that after one day they had become 

 flesh-colored, in two a pale salmon, which, during the third 

 and fourth days slowly deepened to a rich salmon-red and then 

 remained constant until the eleventh day. On the seventli 

 day two small dark eye spots become faintly visible toward 

 one end of the egg, by the eighth day they had become more 

 apparent as small black points within the egg and remained 

 thus until the egg darkened just before hatching. On the 

 eleventh day the head and cervical plate were apparent, the 

 former as a dark area nearly at the end of the egg and the latter 

 as a transverse band close behind it. The dark color of these 

 parts gave a purplish tinge to the whole mass of eggs. On the 

 twelfth day the young larva emerged, effecting escape through 

 an irregularly cut hole at one side of the larger end of the egg. 

 The hole is just at the position on the egg occupied by the head 

 of the larva before hatching, its edge not quite reaching the 

 pole. In this species, as in several others, the egg shell con- 

 sumed by the larva in effecting its escape from the egg changed 

 to a bright red or orange in the intestinal tract, passed through 

 as a solid plug and was voided as a brightly colored particle 

 just in advance of the first excrement. The empty egg shell 

 is pearly white with an irridescent lustre. 



Infertile eggs do not change color and soon shrivel. Some 

 eggs color slightly and then shrivel, indicating that they lack 

 the vitality to develop even though they seem to be fertile. 

 As a rule nearly all eggs hatch, only the last few deposited 

 before the death of the moth being weak or infertile. This 

 leads to the conclusion that the female moths mate but once 

 and from observations on other species this probably takes 

 place shortly after emergence from the pupa. 



The pupa. — Nothing definite can be said about the cocoon 

 or pupa. The few that were formed in the breeding boxes 

 were enclosed in cocoons of silk and debris with nothing to 

 differentiate them from those of other species. 



