238 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



bigb, coiiifal, reddish brick, with a broad yebowish stripe iu trout, iiicdudiug tlie clypeus, and 

 exteudiug baclcward on the vertex to the occiput; sides of the head behind yellowish. 



Tlie body is now yellowish green, with brokeu dull reddish lines ou the sides and a faint 

 reddisli patch on the sides at the base of the third thoracic and lirst abdominal segments, and also 

 on tlie third and sixth abdominal segments. Between the base of the horns is a broad wliitish 

 green band. The back is reddish, inclosing a white dorsal broad line, widening rapidly behind, 

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

 same color begins ou the fifth segment and forks on the seventh segment. Anal legs now a little 

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

 slender, and slightly retractile at the end. 



At tlie end of the penultimate stage, when about to molt, the prothoracic horns are about as 

 long as the head is wide. 



There is an oblique spot on the side of the first abdominal segmeut which is directed forward, 

 ending at the base of the third thoracic leg; also a large lateral brown spot on the side of abdom- 

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

 oblique russet or sere-brown spot on the side of the seventh abdominal segmeut, reaching to 

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

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

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

 molted August 11. 



Mr. Bridgham has figured the larva now to be described, and which he found on the oak at 

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



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

 large conical 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 reiiresented by two minute 

 dark tubercles, which do not seem to bear a hair. There are no other tubercles on the body, as the 

 hairs are fine, minute, and arise from very minute microscopic warts. The body tapers to the anal 

 legs, which are long, slender, and retractile, the small planta' being entirely so. The suranal plate 

 is scarcely separated by suture from the ninth segment; it is smooth, and narrows towai-d the end, 

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

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

 white band originates between the prothoracic tubercles, broadens to the third abdominal segment, 

 ending in a triangular point on the fourth segmeut opposite the apex of another broad white line, 

 which begins on the fifth abdominal segment and sjAits into two on the hinder part of the seventh 

 segment, 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 

 plate, inclosed between the white subdorsal bauds. On each side of the first abdominal legs is a 

 dark oblique blood-red patch iuclosing the spiracle and extending to the third pair of feet, widening 

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

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

 abdominal segment and inclosing the spiracles is a dark blood-red spot, like coagulated birtod, 

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

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

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

 crescent-shaped dash aboA'e the i)lanta?. 



Another caterpillar (PI. XXXII, figs 2, 2rt) was found in two successive years on the red maple 

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

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

 molt, as the prothoracic segment was swollen. 



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

 above into two rather acute piliferous cones, each with a brown line behind. The larva may be 

 readily recognized by a pair of prothoracic horns which are long and 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. Along the body is a 



