MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 233 



It molted, passiiit;- into the last stage August O-IO. 



Ldxt sldnc — Length, o-> nun. Head as in JL lni()i<l<(ta, with a short lateral tbur-coloied band 

 of black, white, pink, and, externally, of yellow. Bodi/ with no reiJdinli hroivn siiots on the side, 

 though quite thickly speckled with dark red-brown. The rudituents or vestiges of the prothoracie 

 horns are very slight, forming a yellowish, slightly swollen area. Dorsal band snow-white, fading 

 into yellowish on the side, where there is a series of fine dark red-black dots; the line is widest on 

 the second a.nd third abdominal segments, and at the suture, between the fourth and fifth segments, 

 the anterior part of the band connects by a nai-row neck with the posterior division of the baud, 

 which contains a whitish vascular Hue, bearing reddish dots on each side. Each side of the body 

 on abdominal segments 7 to 10 snow-white, including the upper part of the anal legs, which are 

 marked with a red line. The thoracic legs are green, with a black dot in the middle. 



Description of another larva on the red maple (PI. XXXI, fig. 1,1(0-— The egg was found July 

 ;! on the red maple at Brunswick, jMe., and it hatched -Tuly 11 or ll.*. The caterpillar eats the 

 surface of the leaf when first hatched. 



Larra, l^tane I. — Length, <i mm. Head moderately large, a little wider than the body, rather 

 short, smooth, with a few scattered hairs, pale cherry red. The body is moderately thick, a little 

 compressed, tapering from the prothoracie segment to the aual legs, the end of the body being 

 upheld, the anal legs loug and slender, but not so long as the tenth abdominal segment is wide. 

 It bears a remarkable series of large black forked dorsal horns, so as to appear like a young 

 Ceratocampid. The first thoracic is slightly wider than the third thoracic segment, and beai's a 

 large shining black cervical phxte, which is uearly twice as wide as long, the posterior edge being 

 straight and blacker than in front. From this plate arise two large black horns, each with three 

 large, loug branches or tines, wliich are thick, acute, ending iu a dark bristle; the trunk of the 

 spiue is short, the tines being three times as long as the undivided trunk, while there is a fourfli 

 minute spur below the others: the two anterior tines rise high and arch over the head. 



The second and third thoracic segments are unarmed, smooth, with no tubercles, but wrinkled. 

 From each .ibdomiiial segment (1 to 8) arises a pair of large high dorsal black horns. Those on 

 th(^ first abdominal segment are nearly twice as large as those on the succeeding segment, and 

 arise from a large black plate which is entire, undivided; the horns m these, as all the abdominal 

 ones, are a little bent beyond the middle, at the end sending off a minute sharp spiue, while they 

 end iu a short black bristle. The six succeeding black dorsal plates are divided into two halves, 

 each half lunate in shape. The third pair of abdominal horns are nearly as large as the first pair, 

 while the three pairs following are of the same size as the second i)air. The last pair of horns 

 arise from the tenth segment, which are not quite so large as those on the eighth, and the segment 

 bears a large undivided black plate which extends down the sides aud to the base of the anal 

 legs, the latter being slender, rather long, shining black, and held extended out horizontally. 

 There are no horns on the ninth segment. 



The body is transversely wrinkled and the ground color is pale yellow, but the sides are so 

 densely covered with fine, short, wavy, cherry-red lines as to appear red. Between the horns on 

 the sixth and seventh abdominal segments is a large clear yellow dorsal area. The thoracic legs, 

 are black; the middle abdominal legs cherry-red, becoming blackish toward the plant:e. 



At times it Jerks its head rapidly from side to side, as if to scare away an enemy. 



Another larva (PI. XXXIII, fig. 1, 1«). — This was a rather belated larva with the body some- 

 what shriveled, which occurred on the oak at Providence September 20-24. Length, lo mm. Head 

 moderately high and narrow; on ea<'h side of aud rather remote from the distinct median suture 

 and uearly parallel to it is a dark thread line, the frontal space inclosed being clear of dots. The 

 ground color of the head is like new parchment; on each side are dark specks, forming a band on 

 each side between the antenna^ and the prothoracie tubercles. The autenme are bright yellow. 

 First thoracic .segment tcith two ticin contif/uous yellowish humps from which arise two pale raw 

 sienna-brown tubercles, each endiwj in a piliferous tubercle, rising quite hiyh over the head; belotc, 

 not quite near the end, arc two minute tubercles, the remnants of the tines of the horns of the 

 earlier stage. On all the posterior segments of the body the piliferous tubercles are obsolete, 

 and can not be detected with the lens. Two thoracic dorsal brown parallel lines beginning between 

 the prothoracie tubercles, converging to the second thoracic segment aud separating so as to form 



