MKMOIUS OF THE NATIONAL ACADEMY OF SCIENCES. 91 



is l;u"ge, the protlioracic dorsal horns aro long-cr than tliick, showiiiii' the ]iriiiiitive nature of tlie 

 genus. Tlie caudal horn is not clearly shown; the lateral infraspiracular spines are a little 

 lonjjer than in ,1. aniijamnthn. Thoui^h the fijjui'e is poorly drawn, the suranal plate and anal 

 lei;-s appear to resenihle thos(< of Adeloet^pliala. 



The pupa is undoubtedly closely similar to that of Adelocepliala, the creiuaster heiny Ion"', 

 slender, and deeply forked. 



The larva" of Roisduval's Astylis. which includes A. T»'sl'!i and A. .soinuier!, l)otIi frf)Ui Brazil, 

 live oil diti'erent .species of bananas (J/usn sn^tientiuni, etc.). 



GeograplucaJ dhtrihution . — Surinam to Brazil (Stoll, Boisduval). 



Until examples of the moths and larviv can be had for study it is impracticable to further 

 discuss the species of this genus. 



Crino sommeri Hiibuer will probalily be found to difl'er generically from C. htjilafrix; in 

 fact it does not appear to belong with th(> Ceratocampin;e, and may prove to be a noctuid. 



(Pis. XXXriI, tig. 4; LVII, iigs. 4, 4a-4c.) 



Syssphinx Hcbner, Verzeichniss Schinm., p. 143. 1818-1822. 



Syssiaphhu- Walkeh, Cat. Lep. Het. Br. Mus., VI, p. 1503. 1855. 



Psephopaech's GiiOTE, Trans. Ainer. Ent. Sue, I, p. 5. June, 1867. $. 



Adelocepliala Grote, Trans. Amer. Ent. Soe. , I, p. ". June, 1867. J. 



CcTOrfcre.-! Boisduval, Annales Soc. Ent. Belgique, XV, p. 81. 1872. 



Syssl])hmx Bcr.meister, Descr. Phys. Rep. Argentine, V. Lep., Pt. 1, p. 492, 1878, Atlas, p. 45. 1879. 



Syssphin.r DnvcE, Biologia Centr.-Aiuer. Insecta, Lep. Het., I, p. 172. June, 1886. 



Syssiphin.1- Kjrby, S\n. Cat. Lep. Het., I, p. 741. 1892. 8chaus, Anier. Lep., p. 19, 1892. 



Imago. — S and 9 . Head nuich depressed, triangular in front, wide between the antennie, 

 but rapidly narrowing much more than in Adelocepliala toward the labrum: the end of the 

 clypeus is prolonged into a large solid knob-like protuberance. In this respect the genus differs 

 from any other of the subfamily. Eyes rather large, larger than in Anisota. Palpi minute, 

 short, slender. Maxilla? of male well developed, more so than usual, being longer than in 

 Adelocephala. The two are separate, loosely curled up, and would, if extended, reach well beyond 

 the front; those of the female invisible. Antenna? of S widely bipectinated to a little beyond 

 the middle, beyond tiliform. without distinct teeth, but instead a pair of rather long fine setw. 

 These of 9 perfectly filiform, with no denticles or .seta?, being simple and round. 



Thorax full, the front overhanging the head as in Adelocephala. Fore wings Smerinthus-like, 

 with the costa straight, the apex sharp, in S the oblique outer edge distinctly, in 9 slightly 

 scalloped and convex. 



Hind wings of S rounded at the apex; outer edge excavated; inner angle well rounded, but 

 in 9 rounded as usual, and the outer edge not excavated but full, more as in Adelocephala and 

 Ani.sota. Hind wings in <J reaching to the outer fourth of the abdomen; in 9 to the end of the 

 latter, extending farther in this direction than in Adelocephala and Anisota. 



Venation (PI. LVII, tigs. 4, 4«, 4c): As in Eacles, Anisota. and Adelocephala vein HI, is 

 wanting; the venation difi'ers in no important respects from Anisota and Adelocephala, as will 

 be seen by reference to the figures. The two dlscal veins make a decided angle, as also seen in 

 A. heilighrodtil. In the hind wings the discal veins are less oblique, the two taken together 

 making more of a curve than in Anisota and Adelocephala. 



Coloration: In general ocher yellow; the hind wings are pink in the middle; no di.scal spot 

 on the fore wings above, but beneath is a large black discal patch. The two usual lines, ba.sal 

 and extradiscal, well marked. On the hind wings a large black roundish discal spot, not centered 

 with white: this .spot is not repeated beneath; the extradiscal line is present, though not verv 

 distinct. 



Genitalia (PI. XLI, figs. 2. 2'7): The suranal plate a flat ol)long plate of uniform width, 

 ending in a fork (as in certain Sphingid*). A single pair of claspers, which are (piite wide, 



