232 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



of the second abdominal i)air arc luucli smaller than tlie pair in front and tliose behind. Those- 

 of tlie third abdominal segment are not so large as the first, but much longer than those behind. 

 The i^air on the eighth abdominal segment are of the same size and shape as those on the first 

 abdominal segment, but are slightly shorter. The suranal plate is rounded, convex, shining 

 black, giving rise to a ]>air of black horns shorter than the shortest ones in front. Thoracic legs. 

 blackish; the middle abdominal legs of a pitchy color. 



It molted July 10, being perhaps belated, as are most in the next stage. 



»S7«Y/e //. — Length, 5-0 mm. Head and body uiiiforndy liver colored or reddish brown. Head 

 conical, rounded, entirely liver-red, like the body, with no lateral bands or any markings. Xoir 

 ihere in only <( single pair of very short horns or tubercles situated on the iwothoracic segment, icith 

 no traces of the others. These prothoracic tubercles arc cylindrical, short, square at the end, 

 which is dark and no longer than one-third the length of the anal legs, with no branches. The 

 end of the body is uplifted; the anal legs are concolorous with the body. The body gradually 

 tapers to the end, with no traces of any markings. 



I found, July li, other larva? ou neighboring maple trees, of which the following is a descrip- 

 tion, and think it is the same species: 



Stage III. — Length, 10 mm. The head is noic rerij large, subtriangular, rising higher than 

 the body behind, and much wider than the body; greenish, with a broad, pale reddish baud on 

 each side, meeting ou the vertex. The prothoracic horns are now represented by the conical 

 piliferous tubercles of moderate size, dark reddish at the end, from each of which a reddish line 

 jtasses back to the first abdominal segment. The third abdominal segment is pale reddish above, 

 the hue passing down to the base of the first i)air of abdominal legs. Along the back of 

 abdominal segments 4 to is a pale reddish l)and interrupted by the sutures. On abdominal 

 segments 7 to is an elongated, reddish, diamond-shaped, dorsal, pale red band, including the 

 suranal plates; a faint reddish lateral spot on the side of the sixth abdominal segment. 

 Abdominal legs yellowish, concolorous with the body. Anal legs long, slender, upheld; thoracic 

 legs pale; the sides of the body just above their base discolored with pale reddish. A distinct 

 subdorsal yellow line ou each side of the body, not so distinct on the last three abdominal segments. 



In three specimens, with little doubt of this species, which were lo mm. in length, there are 

 two parallel red lines extending backward from the j)rothoracic tubercles and diverging, as in 

 the smaller specimens, ou the first abdominal segment. On the third abdominal segment is a 

 crescentiform dorsal red spot, the horns pointing anteriorly; ou the segment behind is a median 

 triangular red patch, aud on the five succeeding ones collectively is a nnu-h smaller one, cleft 

 behind. In this specimen the hollow of the crescentiform spot is filled with a yellow curved spot, 

 but in one of the other examples there is in place of it a white patch, and the crescentiform spot 

 is represented by two short parallel lines. There is another reddish dorsal patch common to the 

 seventh aud eighth segments. Indeed there is nuich variation in the markings. The suboval 

 yellow lines are distinct. There are four small, short, lateral, ()bli(iue, reddish patches on the 

 side of the body, one at the base of the third pair of thoracic legs, another at the base of the 

 fourth pair of abdominal legs, and in one of the specimens one at the base of the first pair of 

 abdominal legs. 



Stage IV. — Length, 18-20 mm. Head large, wider than the body, flattened in front. The 

 band ou each side is rather short aud broad, not reaching to the base of the auteuuie and not 

 meeting above ou the vertex; it is composed of lines of fourcohirs, being black within, then white, 

 then a broad i)ink band bi'oadly shaded externally with yellowish. No tubercles on the top of 

 the prothoracic segment, but a yellowish patch containing two lines forming the beginning of the 

 two parallel reddish sienna brown lines, which end on the first al)dominal segment. Behind this 

 spot are three yellow dorsal lines which end ou the hinder edge of the third abdominal segment.. 

 On this and the next segment is a conspicuous forked sienna-brown line, inclosing on the third 

 segment a white triangular patch. The two subdorsal yellow lines are broad and distinct, edged 

 •within with reddish on the eighth segment and on the suranal i)late. Sides of the body with 

 scattered black specks. Spiracles yellow, finely edged with black. A slight, short, narrow oblique- 

 line on the side at the base of the legs of the third thoracic and sixth abdominal segments. A 

 reddish line on the inside of the anal legs. A black dot ou the middle of the thoracic legs. 



