Cope.] ^"" [Aug. 19, 



From Pebas, Eastern Peru. Numerous specimens from Hauxwell's 

 Collection. 



Other Cliaracinidse contained in the collection are, Macrodon trahira 

 Spix ; Erythrinus brevicanda, Giinth ; Hydrocyon sp. indet ; Myletes duri- 

 ventris Cuv. ; Tetragonopterus ortonii, Gill M.S. 8. Proc. A. N. Sci., 

 Phila., 1870 ; Gasteropelecus stellatus Kner ; Chalcinus brachypomus, C. 

 V. ; Leporinus frederici, Bloch ; Curimatus sp. indet. 



The Characins obtained at Para by De Schulte Buckow for J. Carson 

 Brevoort's Collection, already mentioned, are Leporinus striatus Kner.; 

 L. megalepis, Gunth. ; Schizodon fasciatus, Spix ; Tetragonopterus lepi- 

 durus Kner. ; T. fasciatus; T. stilbe, Cope, T. Gasteropelecus sternicla 

 L. ; Chalcinus brachypomus C. V. ; Myletes lippincottianus, Cope ; Ser. 

 rasalmo piraya ; Serrasalmo maculatus, Kner. The last agrees closely 

 with Kner' s figure and description, except that the young only is spotted, 

 and the caudal fin of young and adult are yellow-edged outside the 

 blackish cross band. 



Odontostilbe fugitiva. Cope gen. et. sp. nov. 

 Char. Oen. Teeth in a single series on the premaxillary and dentary 

 bones only, broadly spatulate and creuate. Anal fin elongate. Lateral 

 line continued to the caudal fin. 



This genus differs from CMrodon (Girard) chiefly in the complete 

 development of the lateral line of tubules. 



C7iar. Spec. D. 10, A. 24, 1.1. 35. Transverse line at vent 11 ; at ventral 

 fins 5 — 5. Teeth, two on each maxillary, five on 

 each premaxillary, and six on each dentary. The 

 j)remaxillaries with seven cusps each, the median 

 more prominent. Those of the other bones with 

 similar cusps of more equal length. Depth of body 

 3.5 times in length, exclusive of caudal fin. Head 

 four times in the same, its profile convex longitu- 

 dinally and transversely, with interorbital width 

 equal diameter of orbit. Latter 3.5 times in length of head. Caudal fin 

 deeply forked. Ventral just in advance of below first dorsal ray. P^c- 

 toi-al barely reaching ventral. Olive silvery, with a silver band, dark- 

 edged above and below, from opposite middle of pectoral fin to basis of 

 caudal. A dark spot at latter point. Cheeks silvery. Length two inches. 

 Pebas, Eastern Equador. Hauxwell's Collections. 

 This little Characin is allied to the Gliirodon alhurnus, Gthr. (P. Z. S. 

 Lond. 1869, 424,) but has teeth on the maxillary, fewer and differently 

 formed on the other bones, more anal radii, different proportions, etc. 



SILURID^. 



HtPOPTOPOMA BILOBATUM. Cope Sp. UOV. 



Character. — Form rather slender. Adijjose fin reduced to a microscopic 



24+?3 

 spine. Teeth numerous, ^g on each side of the mouth. Caudal fin 



deeply forked, with nearly equal lobes. 



