POPLAR INCH-WORMS, 467 



the way conical. Depth of thorax, .40 inch ; of joints 2 to 4, .33. Head, thorax, 

 and wing cases shagreeued, rather coarsely, the head end rounded, eye-cases not 

 very prominent. Abdominal joints punctured, tip ending in six hooks in three sets 

 of two each as to length, the two longer turning outward, the two short at the base 

 turning inward. Color, dark chestnut brown, covered with a glaucous powder. 

 Duration of this period from twenty-eight to thirty-four days. 



October 14, 1882, a female Amatrix was brought to me, from which I obtained the 

 next day 261 eggs. These began hatching May 3, 186'3, and continued hatching to 

 June 21, making the egg period from 200 to 249 days. Only the few that hatched 

 first were fed, and the greater part of those failed to reach maturity, owing mainly 

 to a form of bacterian disease that has prevailed in most of the species of caterpil- 

 lars I have attempted to raise this year, and it has not been confined to the breeding 

 cages, but has been as destructive iu the fields. Two imagiaes were raised, one 

 pupating July 8 and hatching August 3. This gives us a minimum period of 277 

 days from the egg to the imago. Supposing that the difference in hatching of the 

 eggs noticed here is their usual way, this accounts for fresh specimens being found 

 in the woods from August to October, and 1 think very likely with a sufiicient number 

 of eggs other species would show a similar trait. I am of the opinion that all our 

 species are single brooded, this being based on observations of different species in 

 the woods and rearing three different species. 



This species was fed most of the time on cottonwood, though they were fed for a 

 few days on Lombardy poplar. In pupating they spun the leaves together, lining the 

 leaves with a very thin cocoon of silk. Both specimens obtained were males, one 

 with the forewings uniform gray, the other with the dark longitudinal shade through 

 the middle of the wings. (French.) 



43. Geometrid sp. 



The caterpillar here described occurred on the aspen August 10, a*; 

 Brunswick, Me. 



Larva. — Head narrower than the body, somewhat bilobed, smooth, anal legs large, 

 spread out, forming two lateral rounded flaps, when the larva is at rest, with two 

 very large, long, fleshy, conical supra-anal tubercles. General color pale green, like 

 that of the under side of the leaf. Two parallel subdorsal pale yellow, narrow, but 

 distinct lines; the sutures white, spiracles yellowish; thoracic feet green; lower edge 

 of anal legs and tubercles tinged with yellowish. Length, 18™™. 



44. Geometrid sp. 



This larva has a flattened body, like that of Hibernia ; it was found 

 feeding on the aspen at Brunswick, August 25 to September 1. 



Larva. — Body broad and flat, rather short ; head as broad as the body and some- 

 what flattened. Body dark, the segments transversely wrinkled ; dark brown, color 

 of a dark twig; a dark, blackish, broad, dorsal band, with a pale horu-colored band 

 on each side, composed of dark ones alteruat ng with the paler ones; spiracles black; 

 thoracic and abdominal legs pale, spotted with black dots ; body beneath and legs 

 livid; head and prothoracic shield mahngany-brown, spotted with black. Length, 

 18™™. 



45. BoHs oscitalis Grote. 



The caterpillar has been found by Mr. Coquillet in Illinois living in 

 a folded leaf or between two leaves folded together with silken threads 

 on the willow and poplar. Several were found late in July and again 



