Dec. 28, 1916. FisHes orf PANAMA— MEEK AND HILDEBRAND. 321 
of body, .e., from ana)! fin backward, with from 6 to 8 dark cross-bars; a 
dark line from last anal ray to base of caudal; a dark area at base of 
anterior rays of anal, not extending on fin; posterior rays of anal with a 
dusky spot near middle and another at tips; dorsal with a dusky spot 
on posterior one-fourth near base of rays. Color of male very similar, 
but the cross-bars less distinct, and a jet black spot about the size of the 
pupil present on side slightly in advance of vertical from origin of dorsal; 
Fic. 6. DISTAL PART OF INTROMITTENT ORGAN OF Priapichthys tridentiger (Garman). 
(Greatly magnified.) 
no dark spot at base of anterior rays of anal. Specimens from Taboga 
Island paler with the cross-bars less distinct in both sexes. 
Of this species we have numerous specimens from both slopes of 
Panama, but none from the Rio Tuyra Basin. The largest female is 
45 and the largest male 20 mm. in length. 
Habitat: Both slopes of Panama, and Taboga Island. 
58. Priapichthys tridentiger cana (Meek & Hildebrand). 
Gambusia cana Meek & Hildebrand, Field. Mus. Nat. Hist. Pub., 
Zool. Ser., X, 1913, 87 (Rio Satiganti, Cana, Panama). 
Head 3.8 to 4.25; depth 3.2 to 4.35; D. 7 or 8; A. 10; scales 29 to 31. 
This variety agrees with P. tridentiger in all respects, except in color. 
In the female there are no dark cross-bars on posterior part of body. 
In the male the characteristic dark spot of P. tridentiger on side above 
the base of anal is present, but the cross-bars are less distinct. 
This form is represented by 68 specimens from the Rio Satiganti, 
one of the upper tributaries of the Rio Tuyra. The largest female is 40 
and the largest male 23 mm. in length. 
59. Priapichthys dariensis (Meek & Hildebrand). 
Gambusia dariensis Meek & Hildebrand, Field Mus. Nat. Hist. Pub., 
Zoél. Ser., X, 1913, 88 (Rio Capeti). 
Head 3.4 to 4.15; depth 3.4 to 4.5; D. 7 or 8; A. 9 or 10; scales 28 to 31. 
Body moderately compressed; dorsal profile straight over head, 
slightly convex from nape to dorsal; head flat above; snout short, 3.3 to 
4.15 in head; eye 3 to 4.35; interorbital 2.2 to 2.4; mouth small, the gape 
