DEC. 28, 1916. FISHES OP PANAMA MEEK AND HILDEBKAND. 331 



KEY TO THE SPECIES. 

 a. Dorsal fin with 7 rays; anal with n or 12 rays; depth 5 to 6 in 



length. elegans, p. 331. 



aa. Dorsal fin with 9 or 10 rays; anal with 13 or 14 rays; depth 4.35 



to 4.9 in length. brunneus, p. 331. 



67. Rivulus elegans Steindachner. 



Rivulus elegans Steindachner, Denkschr. K. Ak. Wiss. Wien, XLII, 1880, 



85, PI. VI, fig. 6 (Rio Cauca) ; Regan, Ann. & Mag. Nat. Hist., Ser. 8, 



X, 1912, 498 (Rio Condoto, Colombia), and Ann. & Mag. Nat. Hist., 



Ser. 8, X, 1913, 471; Henn, Ann. Carnegie Mus., X, 1916, 108 (Rio 



Condoto and Rio Truando, Colombia). 



Head 3.33 to 3.85; depth 5 to 6; D. 7; A. n or 12; scales 33 to 35. 



Body long, slender, posteriorly compressed; head depressed, wider 

 than deep; snout broad, 3.5 to 4.3 in head; eye 3 to 3.75; interorbital 

 broad, 2.15 to 2.6; mouth rather small, oblique; lower jaw projecting; 

 teeth in the jaws in bands, the outer ones enlarged, curved inward; 

 scales cycloid, with prominent circulae, 7 or 8 longitudinal rows of scalps 

 between base of dorsal and anal; origin of dorsal over posterior one- 

 fourth of anal, and about midway between gill-opening and tip of caudal 

 or slightly nearer the former, the base of the last ray a little behind 

 vertical from base of last anal ray; caudal fin strongly rounded; anal fin 

 inserted notably nearer tip of caudal than tip of snout, the length of its 

 base scarcely equal to the greatest width of head; ventral fins small, 

 about as long as diameter of eye, reaching origin of anal; pectoral fins 

 moderate, not reaching base of ventrals, 1.3 to 1.8 in head. 



Color brownish, sides more or less speckled with dark spots. Most 

 of our specimens with a dark ocellus at base of upper rays of caudal; 

 lower lobe of caudal with or without a black stripe extending from under 

 side of caudal peduncle to end of caudal rays, forming an intramarginal 

 bar. Dorsal and anal more or less dusky. 



There are 22 specimens in the present collection, ranging in length 

 from 26 to 38 mm. All were taken in small brooks near the water shed 

 on the Atlantic slope at Culebra. 



R. elegans is very probably identical with R. godmani Regan. 



Habitat: Panama, south to Colombia. 



68. Rivulus brunneus Meek & Hildebrand. 



Rivulus brunneus Meek & Hildebrand, Field Mus. Nat. Hist. Pub., 

 Zool. Ser., X, 1913, 86 (Toro Point, Canal Zone, Panama). 

 Head 3.3 to 3.7; depth 4.35 to 4.9; D. 10, rarely 9; A. 13 or 14, rarely 



12; scales 34 to 38. 



