14 THE CANADIAN ENTOMOLOGIST. 



cases, head and thorax finely rugose ; a very slightly elevated median 

 smooth line over the head and back of the thorax. Tip of the abdominal 

 joint coarsely wrinkled and tipped with 8 hooks, the two outer the longest. 

 Color dark brown covered over with white pruinescence. The cocoon is 

 made, as in the other species, by fastening leaves together, lined a little 

 with silk mostly where the tip of the abdomen comes and into which the 

 hooks are fastened. Duration of this period 41 to 42 days from the time 

 of spinning to yielding the imagines. 



The eggs were deposited Aug. 15, 1882, by a single female that had 

 been confined under a screen two or three days, 44 being obtained in all. 

 They began hatching April 3, 1883, began pupating April 30, and the 

 imagines appeared from June 8 to 11. This gives us a period of 297 

 days as a minimum of time from the egg to the imago, allowing the eggs 

 to be deposited at the time of year these were. As the species occurs 

 through the whole of the Catocala season, it is probable that the eggs are 

 deposited at different times during the summer. I can not say whether 

 they are single brooded or double, but am inclined to the opinion that 

 there is only one brood in a season from the same parentage, and that the 

 continual recurrence of individuals through the season is due to the differ- 

 ence in development of individuals from the same brood of eggs, and 

 perhaps in part to the difference in time of depositing of the eggs. In a 

 brood of eggs of C. A matrix I found a month's difference between the 

 first and last of hatching, so that I had larvae in the first stage and mature 

 larvse at the same time. Only a few of the eggs of this species hatched, 

 and of these only three passed through all their transformations. If a 

 large number of eggs, as for instance all that may be deposited by a single 

 female, in their hatching showed as much difference of time as did the C. 

 Amatrix eggs, this would account for at least a month of the time this 

 species is seen flying. All the species I have reared require about a 

 month for the growth of the larva, and another month for the pupal 

 period. If the different species are about uniform in this respect, then 

 most of the species must be single brooded, for they do not have an 

 average time of flying sufficient to allow of a second brood from the time 

 of the appearance of the first specimens of the season till they cease fly- 

 ing. But the extra heat of summer may accelerate their development as 

 it does other insects, and in that way give us more than one brood of 

 some species, hence with Ilia and a few others the question of the number 



