REPORT OF THE ENTOMOLOGIST. 151 



The small pale-green caterpillars bite off from six to eight leaves, con- 

 structing a broad flat irregular case ; the leaves on being separated from 

 the twig turning red or yellowish, thus forming a conspicuous patch. 

 This rude case is held together with silk, the worm living in a rude 

 silken tube, and feeding upon the inside of the leaves. The length of 

 this tube, within which the little caterpillar finally changes to a chrysalis, 

 is from 8 to 10 mm in length. 



The worms are found from the first of May through the month of 

 June. One changed to a pupa in its tube about the 20-25th of May, 

 and the moth (in confinement) appeared June 1. Other chrysalids were 

 found in the tubes from June 20 to 30, the moths making their appear- 

 ance early in July. 



The moth is beautifully marked, and probably examples occur through- 

 out the suifcmer. Without doubt the eggs are laid on the twigs or leaves 

 in the summer, and the caterpillars become almost full-fed before the 

 winter, hibernating in their cases, becoming active in the spring. The 

 worms are preyed upon by an ichneumon, the oval cocoon with one pupa 

 which had recently transformed, and another ready to imaginate occur- 

 ring in the cases June 9th. 



DESCRIPTIVE. 



The full-grown larva. Body sleiider, cylindrical, not flattened. Head of the normal 

 form, not modified in shape as in leaf-mining larvae; not so wide as the body, smooth, 

 amber colored. Body tapering slightly towards both ends, pale green, of the same 

 hue as the under side of the leaves of the hemlock. Cervical shield well marked, 

 greenish amber. Each segment is dorsally divided by a transverse suture into two 

 slight folds, on the anterior and larger of which are four dark green piliferous warts 

 arranged in a straight line, and two on the hinder division or fold. There are similar 

 warts on the sides and beneath. Legs 6-f-Bj the thoracic feet are pale, blackish at 

 tip. The four pairs of abdominal legs are concolorous with the body. The supra-anal 

 plate amber-green, with a few long setae, as long as the body is thick. Length Q 1 ** . 



Pupa (alive). In form slender, spindle-shaped, the head considerably narrower 

 than the body, gradually tapering from the thorax to the end of the body; antenna} 

 and wings reaching to the hinder edge of the 5th abdominal segment. End of the 

 abdomen rather blunt and rounded, with a few very fine hairs. Along the side of the 

 abdomen a row of short, thick spinules, one on the side of each segment, none on the 

 back ; a pair of such spines on the under side of the 6th segment. Eyes reddish ; 

 body pale amber, with a greenish tint on the thorax. The two terminal segments 

 darker than the rest of the abdomen, and concolorous with the head. Length, 4-5 mm . 



The moth. Rich buif-yellow, with rich golden and white scales. Head and 

 thorax white, with a few buif-yellow scales. Palpi buff-yellow, with the basal joint 

 somewhat blackish on the upper edge ; terminal joint long and slender, with two black 

 imperfect rings, the tips acute, white; eyes black. Antennae black, with numerous 

 fine white rings; they scarcely taper to the tip. Fore wings long and narrow, of 

 nearly the same width throughout ; the outer edge much rounded ; the fringe at the 

 outer angle long and dense ; buff-yellow, with white and golden scales ; costa black 

 at base ; beyond are three large, nearly equidistant, long black costal spots more or 

 less connected on the extreme costal edge ; three equidistant black points on the sub- 

 median vein, the first situated opposite a point half way between the two basal 

 costal spots ; the second opposite the end of the second costal spot, and the third op- 

 posite the third costal spot ; the third spot is sublinear and ends on the edge of the 

 wing at the internal angle. On the costal part of the apex of the wing is a curved 

 row of four black spots, the fourth situated at the extreme apex of the wing, and on 

 the outer and hinder edge are two or three minute black dots, between which and the 

 fringe is a white patch, the fringe being also streaked with white. All the black 

 spots are more or less edged on one side with white scales. The fringe on the outer 

 costal half is lead color with minute black scales at the apex of the wing. Below and 

 within, the long silky fringe is much paler. Hind wings very narrow, almost linear 

 at tip, and with the fringe concolorous with the fridge of fore wings below and within 

 the apex. Body and legs pale glistening buff-yellow. Hind tibiae long, with a wide 

 fringe ; first pair of tibial spines twice as long and about one-half as thick as second 

 pair ; the tarsi ringed with black and white. Length of body 5 mm ; of fore wing 5 mm ; 

 expanse of wings ll mm . 



