MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 233. 



It molted, passing into the last stage August 9-10. 



Last stdf/c. — Leugtli, 35 mm. Head as iu H. hiuiulata, with a short lateral four-colored band 

 of black, white, pink, and, externally, of yellow. Body with no reddish, hrown spots on the side, 

 though quite thickly speckled with dark red-brown. The rudiments or vestiges of the protlioracic 

 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 

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

 the anterior part of the band connects by a narrow neck with the posterior dixision of the band, 

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

 on abdominal segments 7 to 10 snow-white, including the upi)er 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. 1,1a). — The egg was found July 

 3 on the red maple at Brunswick, Me., and it hatched July 11 or 12. The caterpillar eats the 

 surface of the leaf when first hatched. 



Larva, Stage J. — Length, 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 protlioracic segment to the anal legs, the end of the body being 

 upheld, the anal legs long and slender, but not so long as the tentli 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 bears a 

 large shining black cervical plate, which is nearly 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, long branches or tines, which are thick, acute, ending in a dark bristle; the trunk of the 

 spine is short, the tines being three times as long as the undivided trunk, while there is a fourth 

 minute spur below the others; the two anterior tines rise high and arcli over the head. 



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

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

 the 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 spine, while I hey 

 end in 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 pair. 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 i)late which extends down the sides and to the base of the anal 

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

 There are uo horns on the ninth segment. 



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

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

 the sixth and seventh abdominal segments is a large clear yellow dorsal area. Tlie thoi'acic legs- 

 are black; the middle abdomiiuil legs cherry-red, becoming blackish toward the plantie. 



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



Another larva (PL XXXIII, fig. 1, la).^This was a rather belated larva with the body some- 

 what shriveled, which occurred on the oak at Providence Septemljer 20-24. Length, 15 mm. Head 

 moderately high and narrow; on each side of and rather remote from the distinct median suture 

 and nearly 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 baud on 

 each side between the antenu:e and the prothoracic tubercles. The antenute are bright yellow. 

 First thoracic segment with two twin continuous yellowish humps from which arise two pale raw 

 sicnnabrown tubercles, each ending in a piliferous tubercle, rising quite high over the head; below, 

 not quite near the end, are 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 prothoracic tubercles, converging to the second thoracic segment and separating so as to form - 



