92 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



eiidiiiif in two points, the inner much larger, forniino- a long- sharp spine. Penis a thiolv cvlindrieal 

 style, obtuse at the end. The armature differs decidedly from that of Anisota and Adolocephala 

 in the .simple flat suranal plate, the 2-spined claspers, and the thick obtuse penis. 



This genus, as already remarked Ijy Grote. "'bears a remarkably close though superticial 

 resemblance to Smerinthus. and Boisduval afterwards stated that it has a slight resemblance to 

 certain varieties of Smtr/>ifk>is jjoj}!ih' in the shape of the fore wings, with their scalloped outer 

 edge." Also the tongue is unusually well developed, though Grote states that the oral struc- 

 ture is obsolete. This might by some be regarded as a case of mimicry, though the genus 

 probably lived long anterior to a modern specialized sphingid. It differs from Adelocephala in 

 its larval characters, thei'e being no dorsal spines on abdominal segments 1 to 7, as well as in the 

 genital armature: hence there seems no cause for uniting any of that genus with it. 



There is a good deal of discrepancy (Androrophy) between the two sexes, so much so that 

 the female was referred bj^ Grote to Adelocephala. and the male to his genus Psephopaectes, this 

 being a remarkalde case of male divergence from the more normal or primitive type," which 

 has been preserved by the female. 



The head in front is much narrower than in Adelocephala. 

 and the clypeus is remarkably produced into a prominent knob- 

 like projection, which, so far as I know, is unique in the moths. 

 Larra — Stage L — Very similar to ^1. hico/w, but body not 

 striped; prothoracic segment unarmed; eight long thoracic 

 horns like those of A. hic<iloi\ other spines as in hlcoh»\ but 

 slightly more developed; caudal horn larger and higher, ending 

 in a thick swollen knob, which is square seen from in front, 

 with a bristle on each side. 



Last Htage. — Body thick: it differs from Adelocephala in the 

 fk;. lo.-Haid. litiiuded, of Sijssphinx moiiua: thoraclc splncs being stout and \erv short, while there are no 



mjr. vestigial maxilla-, male. . ,. iii'-i 



spines on the hrst to seventh abdominal segments; the caudal 

 horn is ver}' short, not much higher than thick. The third thoracic and eighth abdominal 

 segments are swollen. 



Geographical dixtrlhutain. — This genus ranges from the tropical zone or eastern coast of 

 Mexico (Jalapa) to Brazil, extending southward, according to Peters (in Schroder), to the La Plata, 

 and presumably northeastern Argentina. 



Food plant. — "Juga vera." 



Ilixtorij of the (/ends. — The group is monotypic, there being but a single species, S. molina, 

 mentioned by Hiibner, who placed it between the Sphinges and Endromis, quite I'emotelj- from 

 Eacles and Citheronia. the gap between being filled by the Notodontida-. Drepanulida", certain 

 Saturniida', and Aglia and Dirphia. 



SYSSFHINX aiOLIN^ Stoll). 

 PI. XXXIII, lig. 4. 

 Phahinii-liomhiix nwUmiSTOLL, Pajjillons Exot., IV, p. 25, 221, Tah. :»2, E. F. ( ? ); Tab. 396, B. ( ^ ). (1781?) 



17S2. 

 Pbalicna moZma Sepp, Papillons de Surinam, III, p. 259, PI. 118, $ and 9 (.Vmsterdam, n. d. ). 

 Syssphinx molina Hcbneh, Verzeicliniss Schiuett., p. 14;?. 1818-1822. 

 Syssitphinx molina W.vlkek, Cat. Lep. Het. Brit. Mus., VI, p. 1503, No. 1. 1S55. 

 Psephopaectes .timuliitilu Gkote, Trans. Amer. Ent. Soc, 1, p. 6, PL 1, fig. 1. g. IStiT. 

 Adetocrphcila grandis iiRoTE, Trans. Amer. Ent. Soc, I, p. 8, PI. 1, fig. 7 J. 18G7. 

 Cerodcres molina Boisdival, Annalcs Soc. Ent. Belgiqne, XV, j>. 81. 1872. 

 Ceratocaiiipa molina Buk.meister, Dcscr. pliys. Rep. Argentine, V. I/'p., Pt. 1, p. 492, 1878; AtlafJ, j). 45, PI. xi.x, 



fig. 1, 1879. 

 Sysspliitix 7nolina Drvce, Biologia Centr. Amer. Lej). Het., 1, i). 172. June, 1866. 

 Sytsisphinx molina Kirhy, Syn. Cat. Lep. Het., I, j). 741. 1892. 



thinx molina Dy.\k, Proc. Ent. Soc., Washington, VIII, p. 428. JSIay 13, 1901. 



"See male preponderance (androrophy) in leiiidopterous insect-s, by A. S. Pacliard. Science, XVII, p. 250, 

 Feb. 13, 1903. 



