MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 91 



is large, the prothonicic dorsal horns are longer than thick, showing the primitive nature of the 

 genus. The caudal hoi-n is not clearly shown; the lateral infraspiracular spines are a little 

 longer than in ^1. aiyi/acantlni. Thougli the figure is poorly drawn, the suranal plate and anal 

 legs appear to resemble those of Adelocephala. 



The pupa is undoubtedly' closely similar to that of Adelocephala, the cremaster lieing long, 

 slender, and deeply forked. 



The larvfe of Boisduvars Astylis, which includes ^1. h('!<ku and ^1. xoinineiu, both from Brazil, 

 live on ditt'ei'ent species of bananas {Mima sapientlum, etc.). 



Geographical d'lxtrihution. — Surinam to Brazil (Stoll, Boisduvai). 



Until examples of the moths and larvie can be had for study it is impractical)le to further 

 discuss the species of this genus. 



Crino somrneri Hiibuer will probably be found to differ generically from C. hellatrix; in 

 fact it does not appear to belong with the Ceratocampina?, and may prove to be a noctuid. 



SYSSPHIISrx Hiibiiev. 



(Pis. XXXIII. tig. 4; LVII. tigs. 4, 4ii-4c.) 



<S'^ssp/i(»w Ht^BNEK, Verzeichiiiss .'schnim., p. 143. 1818-1822. 



Syssisphbix Walker, fat. I>ep. Het. Br. Mus., VI, p. 1.503. 185.5. 



Psephopaectes Gkotk, Trans. Aiiier. Eiit. Soc, I, p. 5. June, 1867. $. 



Adelocephala Grote, Trans. Amer. Ent. .Soc, I, p. 7. June, 1867. 9. 



Ceroderes BoiSDtr\-AL, Annales Soc. Ent. Belgique, XV, p. 81. 1872. 



Syssiphin.r Bcrmeister, Descr. Phys. Rep. Argentine, V. L^p., Pt. 1, p. 492, 1878, .\tlas. p. 45. 1879. 



Syssphinx Drite, Biologia Centr.-.\mer. Insecta, Lep. Het., I, p. 172. June, 1886. 



Syssiphin.c KiRBY, Syn. Cat. Lep. Het., I. p. 741. 1892. Schaus, Amer. Lep., p. 19, 1892. 



Tmago. — i and ? . Head much depressed, triangular in front, wide between the antemue, 

 but rapidly narrowing much more than in Adelocephala 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. Maxilhv 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 $ widely bipectinated to a little beyond 

 the middle, beyond filiform, without distinct teeth, but instead a pair of rather long tine setse. 

 Those 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 $ the oblitjue outer edge distinctly, in 9 slighth' 

 scalloped and convex. 



Hind wings of <? rounded at the apex; outer edge excavated; iiuier angle well rounded, liut 

 in 9 rounded as usual, and the outer edge not excavated t)ut fidl, more as in Adelocephala and 

 Ani.sota. Hind wings in S 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, figs. 4, 4</, 4f): As in Eacles. Anisota. and Adelocephala vein HI., is 

 wanting: the venation differs in no important respects from Anisota and Adelocephala, as will 

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

 ^■1. htillghrodtlt. In the hind wings the discal veins are le^s obli((ue, tlie two taken together 

 making more of a curve than in Anisota and Adelocei)hala. 



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

 on the fore wings above, but t)eneath is a large black discal patcii. The two usual lines, basal 

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

 with white: this spot is not repeated beneath: the extradiscal lin(> is present, though not ^erv 

 distinct. 



Genitalia (PI. XLI, figs. "2. iW): The suranal plate a fiat oblong \\\:\U- of uniform width, 

 ending in a fork (as in cei'tain Sphingid;e). A singl(> j)air of claspers. which are <juite wide, 



