MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 95 



The caudal horn (on the eit^hth abdominal segment), unlike ^1. hiculor. is larger and hio-her, as 

 long- as the body is thick, ending- in a l)road, squarish, thick, swollen knob, and is not deeply bitid 

 as it is in ^1. hinihtr (tigs. 1, a, h. Ih). From the anterior edge arise, each from a small tubercle 

 long- bristles, equaling the width of the bulb or knob: the stem bears stouter but a less number of 

 dig-itiform tubercles than A. hicoJoi'. 



On the ninth abdominal segment is a minute dorso-median, slender tubercle, giving rise to 

 two slender bristles (i/y, ix); it is nnich as in ^1. hicolor, l)ut slightly larger and not so dark. 

 All the tubercles on the body, except those on thesuranal plate, are tiiiely wrinkled, and the setie 

 are tinel)' but sparsely setose. The suranal plate not granulated; with a large 3-headed tubercle at 

 the base on each side (this is small and simple in A. hicolor), three smaller setiferous tubercles on 

 each side toward the end. The general shape and armature of the two forms (Syssphinx and 

 A. hicolor) is the same as regards the suranal plate and anal legs. 



Syssphinx on hatching difl'ers decidedly from A. hlcolor in haying no lines, stripes, or any 

 other specialized deposits of pigment, while in alcoholic specimens of ^4. hlcolor the dark lines 

 are distinct. Judging- from the lack of ornamentation at this stage ^4. hieoJor is hatched in a 

 more advanced stage, but judging from the armature (caudal horn) it is decidedly more primi- 

 tiye, this horn reaching- a considerable degree of specialization. 



Laat sUi</e. — For a description and colored figure of the fully grown caterpillar we are 

 indebted to Burmeister. He states that it ditiers from other species of Ceratocampa by the want 

 of spines on the tirst thoracic and all the abdominal segments except the eighth, which like those 

 on the second and third thoracic segments is ""recourbee en crochet." The body is quite thick, 

 the surface of the segments finely granulated with black dots. The ground color is green, with 

 a yellow lateral line, which begins between the dorsal spines of the third thoracic seo-ment. 

 These spines are equally yellow, like the caudal one, all haying the tip red. 



The eighth abdominal segment is swollen or humped up; the ninth segment and suranal 

 plate are transyersely ridged in an unusual way. On each side of the head is a yellow line. 



It chiefly difl'ers in the reduction of the thoracic and caudal spines; these being stout and 

 short; those on the two last thoracic segments being conical and not oyer three times as lono- as 

 thick at the base, while the caudal horn, judging ))y Buruieister's flgure, is but little longer than 

 thick at the base. 



Pupa. — Judging from Sepp"s figure the pupa closely resembles that of Adelocephala and 

 Anisota, the cremaster being forked, flat, long, and the body more or less spined. 



Food 2?lant. — According to Sepp, as quoted In' Burmeister, the caterpillar feeds on the 

 '"''Juga veray Peters states that "the green, often bluish, caterpillar liyes on diflerent Legumi- 

 nosiv, i. e.. on the yellow flowering Cassia and on trees called there (Noya Friburgo, 30 miles from 

 Rio de Janeiro) Sanandii and Bandarra.'" 



PSYSSPHIlSrX PETKHSII Peters. 

 f Syssphinx pelenuVYn-EBs,, Die Heteroceren-Rauiien, p. 10, 1901, Taf. Ill, tig. 3, Pupa, fig. 3a. 

 Imago. — ? Fore wings reddish brown, with many small black flecks and an oblique trans- 

 verse externally pale, within darker, line extending from the apex of the fore wing to the middle 

 of the inner edge. Hind wings dark carmine red, with the edges of the color of the fore wino-s. 

 Abdomen concolorous with the hind wings. Expanse of wings 14-16 cm. (Peters.) 



Larva. — As figured by Peteis it difl'ers from S. ihoHiki; there are two twin conical tuber- 

 cles on the prothoracic segment: a pair of long dorsal spines on the second and third thoracic 

 segments, of nearly equal length, nearly as long as the segments are thick; the body gradually 

 widens to the eighth af)dominal segment, which, however, bears no distinct "caudal horn." The 

 larva also difl'ers from that of .*?. molinu in having low conical dorsal tubercles on abdominal 

 segments 1-7. The suranal plate is much longer and larger, though with no salient spines, but 

 marked with yellow warts. 

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