MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 95 



Th(> caudal horn (on tlio oit;litli iilKlominal segment), unlike .1. hifi>loi\ is largerand higher, as 

 long iis the body is thick, ending in a hroad, snuarisii. tliick. swollen knol>. and is not deeply liitid 

 as it is in A. hivaJor (tigs. 1, n. h. l/»). From tlie anterior edge arise, each from a small tubercle, 

 long bristles, equaling the wiiltli of the bull) or knob: the stem bears stouter but a less number of 

 digitiform tubeivles than .1. liii-nlnr. 



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

 two slender l>ristles (IJ, ix); it is much as in ^4. hln,li,i\ but slightly larger and not so dark. 

 All the tubercles on the body, except those on thesuranal plate, ai-e tinely wrinkled, and the setie 

 are tinely but sparsely setose. The suranal plate not granulated; witii a large 3-headed tubercle at 

 the base on each side (this is small and simple in ^1. hicoloi'), three smaller setiferous tubercles on 

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

 ^1. htcolor) is the same as regards the suranal plate and anal legs. 



Syssphinx on hatching differs decidedly from ^1. liieolor in having no lines, stripes, or any 

 other specialized deposits of pigment, while in alcoholic specimens of A. hicolnr the dark lines 

 are distinct. Judging from the lack of ornamentation at this stage A. h/'culor is hatched in a 

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

 tive, this horn reaching a considerable degree of specialization. 



Z(hif sfiti/e. — For a description and colored figure of the fully grown caterpillar we are 

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

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

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

 the surface of the segments finel_y granulated with l)lack dots. The ground color is gi'een, with 

 a yellow lateral line, which begins between the dorsal spines of the third thoracic segment. 

 These spines are equally j-ellow, like the caudal one, all having the tip red. 



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

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



It chiefly differs 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 over three times as long as 

 thick at the base, while the caudal horn, judging by Burmeisters ffgure, 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. 



Fund pJaid. — According to Sepp, as quoted bv Burmeister, the caterpillar feeds on the 

 ^'■Juga ve)'a." Peters states that "the green, often bluish, caterpillar lives on different Legumi- 

 nosa?. i. e.. on the yellow flowering Cassia and on trees called there (Nova Fril)urgo, 30 miles from 

 Rio de Janeiro) Sauaudu aud Bandarra." 



PSYSSPHCINX PEXERSII Peters. 



fSijssphinx petersii Peters, Die Heteroceren-Raupen, p. 10, 1901, Taf. Ill, fig. 3, Pupa, fig. .3a. 



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

 verse externalh' 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 wings. 

 Abdomen concolorous with the hind wings. Expanse of wings IJ—Ki cm. (Peters.) 



Lii/'va. — As figured by Peters it differs from S. i/ioh'na; 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 ecjual length, nearlv as long as the segments are thick; the body gradually 

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

 larva also differs from that of .§■. niolhin 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. 

 Vol. 9—05 7 



