Dec. 28, 1916. Fishes of Panama — Meek and Hildebrand. 329 



64. Mollienisia caucana (Steindachner). 



Girardinus caucanus Steindachner, Denkschr. K. Ak. Wiss. Wien, XLII, 



1880, 87, PI. VI, figs. 4 & 5 (Caceres, Colombia), and Denkschr. K. 



Ak. Wiss. Wien, LXXII, 1902, 146 (Baranquilla, Colombia). 

 Pcecilia caucana Regan, Biol. Cent. Amer., Pisces, 1908, 190. 

 Mollienisia sphenops Regan, Proc. Zool. Soc. London, 1913, 1012 (in 



part). 



Head 3.35 to 3.7; depth 3.6 to 4; D. 7 or 8; A. 8 or 9; scales 28 

 to 30. 



Body compressed; head slightly depressed, flat above; snout rather 

 broad, 3.2 to 4.4 in head; eye 3 to 3.75; interorbital 2.3 to 2.7; mouth 

 small, the cleft transverse; teeth and scales as in preceding species; 

 origin of dorsal in female over origin of anal, a little nearer end of snout 

 than tip of caudal; slightly more anteriorly situated in male; caudal fin 

 scaly at base, the margin rounded; anal fin in female inserted a little 

 nearer end of snout than tip of caudal; in the male this fin is inserted 

 somewhat nearer end of snout than base of caudal, the modified portion 

 usually about equal to length of head, its structure apparently identical 

 with that of the preceding species; ventral fins in females reaching vent, 

 the outer ray produced in males, reaching beyond base of anal; pectoral 

 fins moderate, 1.2 to 1.66 in head. 



Color of the sexes similar, olivaceous; dorsal fin with a dark blotch 

 at base of the middle rays; fins otherwise unmarked. 



This species is represented by 22 specimens in the present collection. 

 The largest female is 35 and the largest male 30 mm. in length. It 

 was taken by us at only two places, Aruza and Cituro, in the Rio Tuyra 

 Basin. This is the only species of Mollienisia collected in that river 

 basin. 



This species is apparently closely related to M. sphenops, but differs 

 in color, and in the nimiber of dorsal and anal rays. 



Habitat: Pacific slope of southeastern Panama and the eastern 

 slope of Colombia. 



65. Mollienisia cuneata (Carman). 



PcBcilia cuneata Garman, Mem. Mus. Comp. Zool., XIX, 1895, 62, PI. V, 



fig. 3 (Turbo, Gulf of Darien). 



Head 4; D. 8 to 10; A. 9 or 10; scales 28 or 29. 



Body short and deep; caudal peduncle deep; head depressed, broad 

 and flat; snout as long as eye; mouth wide, the jaws weak and loosely 

 joined; outer series of teeth slender, oar-shaped, movable; inner bands 

 small, pointed; eye half interorbital space, its length 3>^ in head; origin 

 of dorsal over third ray of anal, midway from base of caudal to head: 



