FISHES OF WEST COAST OF PERU. 37 



Family LORICARIIDAE. 



KEY TO PERUVIAN GENEBA. 



a\ Dorsal fin, I, 7 to 10 ; anal I, 3 to 5 Chaetostomus, p. 37. 



a\ Dorsal fin, I, 6; anal I, 5 or C Cyclopium,p.S7. 



Genus CHAETOSTOMUS Tschudi. 



48. CHAETOSTOMUS LOBORHYNCHUS (Tschudi). 



Chaetostoma loborhynchos Tschudi, Fauna Peruana, Plsc, 1845, p. 26, 



pi. 4 ; Rio Tullumayo, Andes of Peru. 

 Chaetostomns lohorhynchus Gxjnthee, Cat. Fish. Brit. Mus., vol. 5, 1864, 



p. 250. — Regan, Monograph Fish. Fam. Loricariidae, Trans. Zool. Soc. 



London, vol. 17, 1904, p. 246. — Eigenmann, Cat. Freshwater Fishes of 



Tropical and South Temperate America, 1910, p. 410. 



Genus CYCLOPIUM Swainson. 



49. CYCLOPIUM SIMONSII (Regan). 



Arges simonsii Regan, Monograph Fish. Fam. Loricariidae, Trans. Zool. 

 Soc. London, vol. 17, 1904, p. 317, pi. 21, fig. 9; Huaras, Peru, 10,700 

 feet. 

 Cyclopium simonsii Eigenmann, Cat. Freshwater Fish., Tropical and South 

 . Temperate America, 1910, p. 417. 



Family POECILIIDAE. 



THE KILLIFISHES. 



KEY TO PBEUVIAN GENERA. 



a'. Ventrals present ; jaws with bands of subconical, hooked teeth. 



Aplocheilus, p. 37. 



a'. Ventrals absent ; teeth in jaws in a single series or in a narrow band ; 



pharyngeal teeth present, slender Oresiias, p. 37. 



Genus APLOCHEILUS McClelland. 



50. APLOCHEILUS PERUANUS (Regan). 



HaplocJieilus peruanus Regan, Ann. Mag. Nat. Hist., vol. 12, 1903, p. 626; 



Perira, Peru, 800 meters. 

 Aplocheilus peruanus Eigenmann, Cat. Freshwater Fish. Trop. and South 



Temp. Amer., 1910, p. 454, name only. 



Genus ORESTIAS Valenciennes. 



KEY TO SPECIES. 



a'. Form elongate, in adult. 

 &\ Scales granulate. 



c\ Mouth large; teeth many cuvieri, p. 38. 



c". Mouth small; teeth few pentlandii, p. 39. 



6^ Scales striate; mouth small elegans,p.40. 



40656°— Bull. 95—17 4 



