108 Annals of the Carnegie Museum. 



Genera and Species of P(eciliid^. 



Genus RivULUS Poey. 



Rivulus Poey, Memorias sobre la Historia Natural de Cuba, II, 1858, 307, 383; 

 Garman, Mem. Mus. Comp. Zoo!., XIX, i, 1905, p. 134; Regan, Ann. Mag. 

 Nat. Hist., (8), X, 1912, p. 495. 



Type, Rivulus cylindraceus Poey. 



Small, usually depressed, oviparous fishes, in which the margins of 

 the eyes are not free and the gill-membranes are separate and free from 

 the isthmus. Dorsal smaller than the anal and placed much farther 

 back. The sexes do not differ, except that the female is generally 

 brighter and usually has a caudal ocellus. 



Teeth in each jaw, an outer series of sharp, recurved canines, with 

 several rows of minute teeth behind them. 



1. Rivulus cylindraceus Poey. 



5812 a, C. M. 35 mm. Los Indios, Isle of Pines. Gustav Link. 



2. Rivulus hartii (Boulenger). 



Haplochilus hartii Boulenger, Ann. Mag. Nat. Hist., (6), VI, 1890, p. 190; Regan, 



Proc. Zool. Soc. London, 1906, I, p. 389, pi. XXI, fig. 2. 

 Rivulus hartii Regan, Ann. Mag. Nat. Hist., (8), X, 1912, p. 501. 



13608, L U. M. Three, 25-46 mm. Quebrada Cramalote, V'illa- 

 vicencio, Colombia. Gonzales. 



13609, I. U. M. Two, 23-47 mm. Barrigona, Rio Meta. Gonzales. 

 These specimens are provisionally placed here. D. 8-9; A. 12, 13, 



14 and 15; lat. 1. 38-40. They resemble R. hartii, but the caudal is 

 rounded and without a black margin. 



3. Rivulus elegans Steindachner. 



Rivulus elegans Steindachner, Denkschr. Akad. Wissen. Wien, XLII, 1880, p. 85, 

 pi. VI, fig. 6; Regan, Ann. Mag. Nat. Hist., (8), X, 1912, p. 498 (Rio Condoto, 

 Colombia); ibid., 1913, p. 471- 



5810 a-d, C. M.; 13601 L U. M. Twelve, 23-45 mm. Rio Condoto, 

 Colombia. Wilson. 



5811 a-i, C. M.; 13602 I. U. M. Twenty three, 17-31 mm. Rio 

 Truando. Wilson. 



Head 4-4.2; depth 5; depth of caudal peduncle 7-5-8 in length to 

 base of caudal and 2 in head. Eye 3.5 in head and 1.5 in interorbital. 



