238 MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 



hij;li, conical, reddish brick, witli a broad yellowisli stripe iu trout, iiichidiug tlie clypeus, aud 

 extending backward on the vertex to thft occiput; sides of the head behind yellowish. 



The l)()dy is now yellowish iirecii, with broken dull reddish lines on the sides aud a faint 

 reddish patch on the sides at the base of tlie thiid tlioracic and fust abdominal segments, aud also 

 on the third and sixth abdorainal segments. Between the base of the horns is a broad whitish 

 green band. The back is reddish, intilosing a white dorsal broad line, widening rai)i(lly behind, 

 edged with yellowish; this line ends on the fourth abdominal segment. jVnother band of the 

 same color begins on the fifth segment aud forks on the seventh segment. Aual legs uow a little 

 longer than before and lined with reddish ou the outside. The anal legs are rather long and 

 slender, aud slightly retractile at the eud. 



At tlie eud of the penultimate stage, when about to molt, the protboracic horns are about as 

 long as the head Is wide. 



There is an oblique spot on the side of the tirst abdominal segment which is directed forward, 

 ending at the base of the third tlioracic leg; also a huge lateral brown spot ou the side of abdom- 

 inal segments 3 to 5, passing dowu upon the base of the tirst pair of abdominal legs, and another 

 oblicpie russet or sere-brown spot ou the side of the seventh abdominal segment, reaching to 

 the base of the pair of middle abdominal legs. The dorsal median baiul is snow-white, aud the 

 anterior portion is connected by a narrow neck at the suture between the fourth and fifth 

 abdominal segments with the posterior portion; the upper side of each anal leg is also white. It 

 molted August 11. 



Mr. IJridgham has figured the larva now to be described, aud which he found ou the oak at 

 Providence, September 10 (PI. XXXII, figs. 3, 3a). I also fouud it at Brunswick, Me., September 8. 



SUiffe IV. — Length, 20 mm. The head is deeply bilobed ou the vertex, each lobe ending iu a 

 large couical rounded lobe; it is dull lilac, and is much paler, almost rosy, up and down the front. 

 The first thoracic segment shows no signs of horns, these now being represented by two miuute 

 dark tubercles, which do not seem to bear a hair. There are no other tubercles ou the bodj^, as the 

 hairs are fine, minute, and arise from veiy miuute microscopic warts. The body taiiers to the aual 

 legs, which are long, slender, and retractile, the small x)lautai being entirely so. The suranal plate 

 is scarcely separated by suture from tlie ninth segment; it is smooth, aud narrows toward the eud, 

 where it is regularly rounded; at and below the end are two round tubercles situated above the 

 base of tlie aual legs. The body is delicate green, with a yellowish hue. A dorsal broad, very 

 white baud oi-iginates between the prothoracic tubercles, broadens to the third abdomiuiil segment, 

 ending in a triangular point ou the fourth segment opposite the apex of another broad white line, 

 whieli begins ou the fifth abdominal segment and splits into two ou the hinder part of the seventh 

 segineut, forming two broad subdorsal lines which extend to the end of the anal legs, the inner 

 aspect of which is reddish pitch in color. A similarly colored median stripe on the suranal 

 phit(^, inclosed between tlie white subdorsal bands. On each side of the first abdominal legs is a 

 dark olilicpie blood red patidi inclosing the spiracle and extending to the third pair of feet, widening 

 at tlie end. A large lateral, roundish, oval patch ou the side of the third segment; it is dark and 

 paler red and extends down to the iilanta^ of the first abdominal legs. On the sides of the sixth 

 abtiominal segment and inclosing the spiracles is a dark bloodred spot, like coagulated blood, 

 inclosing the spiracles, and in front bearing a light pink irregular jiatch,. and continued upon the 

 base of the fourth pair of abdominal legs. The spiracles are deej) orange-brown. The thoracic 

 legs dark red, greenish at the sutures. The three last pairs of middle abdominal legs with a reddish 

 crescent-sliaiied dash above the planta'. 



Another caterpillar (PI. XXXU, figs 2,2a) was fimud iu two successive years ou the red maple 

 at Brunswick, Me., August 20-25. It rests ou the underside of the leaf ou the midrib, the head 

 touching the leaf and the anal legs outstretched and holding ou to the midrib. It was about to 

 molt, as the prothoracic segment was swollen. 



tStdffe IV. — Length, 25 mm. The head is pale flesh colored, narrow, the vertex prolonged 

 above into two rather acute ])iliferous cones, each with a brown line behind. Tlie larva may be 

 readily recognized by a pair of prothoracic horns which are long aud high, being about half as 

 long as the body is wide, with three prongs; they are light brown in color. The body is very 

 narrow, compressed, pale green, the color of the leaf on which it feeds. Aloug the body is a 



