110 Annals of the Carnegie Museum. 



All of these localities except Boquia, which is in the Cauca basin 

 west of the central Cordilleras, are in the highlands of the Magdalena 

 Basin, west of Bogota. 



Very similar in proportions to R. elegans, differing in the smaller , 

 scales and in coloration. 



Head 3.8-4; depth 5-5.2; caudal peduncle 7-8 in length and 2 in 

 the head. Eye 3 in head; 1.5 in interorbital. D. 9-1 1; A. 15-16; 

 scales 40-42 in lateral series, 9 in transverse series. 



Origin of dorsal twice as distant from the point a snout-length 

 behind the eye as from the base of the caudal, or about two head- 

 lengths behind the operculum. Other fins as in R. elegans, except that 

 the caudal is sub-truncate, not oval or rounded. 



Olivaceous, streaked and blotched with dark brown. Dorsal and 

 caudal streaked with the same color. Operculum underlaid with 

 blackish. A series of heavy vertical purplish blotches in the mid- 

 lateral line. Females have a circular caudal ocellus surrounded by a 

 white margin. Males have the tip of the anal and both caudal edges 

 margined with black. 



5. Rivulus waimacui Eigenmann. 

 Regan (Ann. Mag. Nat. Hist., (8), X, 191 2, p. 497) regards Rivulus 

 waimacui Eigenmann as synonymous with R. holmice Eigenmann. 

 These species while similar are, however, distinct. The distinguishing 

 characters are sufificiently indicated in the key accompanying the orig- 

 inal descriptions while other points are: 



a. Origin of dorsal about two, or less than two and one-half, head-lengths behind 

 the operculum; D. 8-9; A. 16; scales in lateral series forty-three or forty- 

 four, with about three on the base of the caudal; a median predorsal series 

 of about twenty-seven scales; this series is discontinued five or six scales 

 before the dorsal, where those of the two sides dovetail or overlap the median 



line; females with a caudal ocellus R- holmicB. 



aa. Origin of dorsal two and one-half, or more, head-lengths behind operculum; 

 D. 8; A. 14; scales in lateral series forty-seven to fifty, with three or four on 

 base of caudal; a regular median series of thirty-three to thirty-eight scales 

 between occiput and dorsal; females without a caudal ocellus. . .R. waimacui. 



6. Rivulus urophthalmus Giinther. 

 Rivulus urophthalmus Gunther, Cat. Fishes, Brit. Mus., VI., 1866, p. 327; Regan. 

 Ann. Mag. Nat. Hist., (8), X, 1912, p. 498. 



4631, C. M. Eight, 24-33 mm., Alagoinhas, Rio Catu, Bahia. Hase- 

 man. 



