On Freshicater Fishes from Costa Rica. 455 



Heteroscyllium, nom. nov. 



Brachcehirus (non Ogilb. 1906), Ogilb. Proc. R. Soc. Queensland, xxi. 

 1907, p. 3. 



Brach^lueus. 



Bmchcelurus, Ogilb. Proc. E. Soc. Queensland, xx. 1906, p. 27 ; Regan, 



Proc. Zool. Soc. 1908, p. 354. 

 Cirriscy Ilium, Ogilb. Proc. R. Soc. Queensland, xxi. 1907, p. 4. 



Heteroscyllium colcloughi, described bj Mr. Ogilby from 

 Queensland, seems to differ generically from BracJicelurus 

 modestus in the less depressed head and more inferior mouth, 

 but especially in having the anal fin separated from the 

 caudal by a distinct interspace (rather more than ^ the length 

 of its base). 



LX. — A Collection of Freshwater Fishes made hy Mr. C. F. 

 Uaderioood in Costa Rica. By C. Tate Regan, M.A. 



Characinidse. 



1. Tetragonopterus ceneus, Gilnth. 

 Rio Iroquois (Atlantic Slope) and Rio Grande de Terraba. 



2. Tetragonopterus scleroparius, sp. n. 



Tetr(igonoj)terus fasciatus (part.), Giinth. Cat. Fish. v. p. 322 (1864). 

 Tetragonopterus petenensis (part.), Giinth. t. c. p. 326. 

 Tetragonopterus simus (pai't.), Bouleng. Boll. Mus. Torino, xiii, 1898, 

 no. 329, p. 2. 



Depth of body 2^ to 3 in the length, length of head 3| to 

 4|. Snout shorter than eye, the diameter of which is 3 to 3i 

 in the length of head; interorbital width about 2], in the 

 length of head. Maxillary extending to the vertical from 

 anterior edge of eye; 2 to 5 maxillary teeth. Suborbitals 

 broad, the lower edge of the second in contact with the lower 

 limb of the prgeoperculum. 10 to 12 gill-rakers on the lower 

 part of the anteiior arch. 36 to 41 scales in a longitudinal 

 series, 6 or 7 in a transverse series from origin of dorsal fin 

 to lateral line, 5 to 7 between lateral line and base of pelvic 

 fin. Dorsal 10-11; origin behind the pelvics ; longest ray 

 shorter than the head ; free edge a little convex. Ana! 

 27-32, with 24 to 28 branched rays; origin below end of 



