MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 259 



are slightly siiM'ascd witli a greenish yellowish tint, lliucl wings with a distinct whitish line, 

 within which the wing is white, but beyond dusky. 



The two paii-.s of hind tibial spurs are long- and well developed. My original type is iu the 

 collection of the American Entomological Society, Philadelphia. 



EfKi. — Diameter, 1.2 nun. Low, flattened, hemispherical, much broader than high; in slmpe 

 much like that of H. niiicolor, but larger. Shell covered with i)olygonal areas, seen under A inch A 

 eyepiece, with rather tliin, not very distinct walls, not (jnite so distinct as in H. unicolor. Micro- 

 pylar region forming a rosette of four circles of elongated, crowded, small polygonal areas. 



For several eggs I am indebted to Mr. Tallant, of Columbus, Ohio. They hatched July 27, 

 in Maine. 



Larva, Stage I. — Length of body without the tails, 3.5 mm.; of the tails, 2.5 mm.; total 

 length, G mm. Head moderately large, as wide as the prothoracic segment, but wider than tlie 

 body in the middle. The head is unusually short, flattened iu front, pale greenish yellowish and 

 rusty brown on the sides. On the prothoracic segment are two long, high, rust reddish tubercles, 

 which are darker at the end, conical and rounded at the tip, and bearing a light seta; they are 

 inclined forward, and are situated far apart on the extreme side of the segment. The body behind 

 is narrow, cylindrical, scarcely tapering to the ninth segment. The segments are not convex, but 

 are transversely wrinkled and uniformly yellowish green. The only marking is a slight broken 

 dorsal median obsolete line, represented by a faint elongated spot iu the middle of the body and 

 another near the end. 



The tails (stemapoda) are long, like those of Cerura, being almost as long as the body and 

 very slender. Their basal third is ]>ak' greenish; beyond, reddish brown, becoming paler just 

 before the tip, which seems to be enlarged. 



It differs from the young larva of Cerura in the prothoracic horns being vertical and laterally 

 projecting. 



Before molting the pink dorsal line becomes a little more pronounced. 



July 31 it was about to molt, when the length of the body was G mm.; of the tails, 4 mm.; 

 total, 10 mm. 



It was found just molted on the morning of August 2. 



Stage II. — Length of body, 7 mm. ; of the tails, 5 mm. ; total, 12 mm. 



The head is now wider than the body and entirely peagreen or with a reddish hue; the body 

 is a pea-green with a yellowish tinge. The tubercles on the prothoracic segment are nearer 

 together at their base; they are dark coral-red, paler at base, and from them a durl; pinlc dorsal 

 lint extends buck to the suranal plate, widening on the second, fourth, and fifth {according to the 

 figures the third, si.vth, and eighth abdominal) segments. The tails are pale on the basal half, 

 beyond deep pink, and interrupted near the end by a pale ring. All the legs, both thoracic and 

 abdominal, are pale green and of the same green hue as the body. The segments are transversely 

 wrinkled. 



Stage III. — Whether the following description ajjplies to the end of the second or beginning 

 of the third, I am not entirely sure, but suppose it applies to the third stage. I was unable to find 

 the cast skin. 



Length of body, 10 mm.; of tails, i mm.; total, 14 mm. 



The head is noiv subcorneal, narrowing decidedly above toward the vertex; it now has a 

 reddish jn'h/i stripe on each side, with yellow behind. The dorsal red stripe is now continuous, 

 widening on the second and fourth abdominal segments, on the fourth forming a diamond-shaped 

 spot. The two tubercles on the iirothoracic segment are large, deep coral-red, and the space in 

 front at their base is whitish, but wider than iu the next stage. 



A subdorsal irregular yellow line, sending an oblique narrow bar or stripe from one segment 

 d(in-uir(ird to the loicer and hinder edge of the one behind, so that the second and third thoracic 

 segments and abdominal segments 1 to 8 appear to hare tiro narrow yellow oblique bars. The tails 

 are now about one-third as long as the body, and still reddish. 



The larva has now acquired the features of the fully developed larva, with the exception that 

 the horns of the prothoracic segment are larger and prominent. 



The following description is of an individual found on the underside of a beech leaf at 

 Brunswick, 31 e., August G: 



