Dec. 28, 1916. FisHes or PANAMA— MEEK AND HILDEBRAND. 331 
KEY TO THE SPECIES. 
a. Dorsal fin with 7 rays; anal with 11 or 12 rays; depth 5 to 6 in 
length. elegans, Pp. 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. 11 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 circulez, 7 or 8 longitudinal rows of scales 
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 38mm. 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., 
Zoél. Ser., X, 1913, 86 (Toro Point, Canal Zone, Panama). 
Head 3.3 to 3.7; depth 4.35 to 4.9; D. ro, rarely 9; A. 13 or 14, rarely 
12; scales 34 to 38. 
