320 Fretp Museum or Naturat History — Zoétocy, Vo. X. 
b. Body posteriorly with 6 to 8 dark cross-bars, present in both 
sexes. tridentiger, p. 320. 
bb. Body in females plain, no cross-bars, male with very indistinct 
cross-bars. tridentiger cana, p. 321. 
aa. First produced ray of intromittent organ without a recurved 
spur below its apex. 
c. First produced ray of anal anteriorly serrate below apex, and 
bearing a hook at apex directed downward and forward, the 
anterior branch of the second produced ray curved forward at 
apex; a dark area at base of anterior rays of anal. 
dariensis, p. 321. 
ec. Intromittent organ without hooks or serrations, the apex curved 
forward; a dark area about vent. panamensis sp. nov., p. 322. 
57. Priapichthys tridentiger (Garman). 
Gambusia tridentiger Garman, Mem. Mus. Comp. Zool., XIX, 1895, 
89, Pl. IV, fig. 10, teeth (Isthmus of Panama); Regan, Biol. Cent. 
Amer., Pisces, 1907, 95. 
Priapichthys tridentiger Regan, Proc. Zool. Soc. London, 1913, 992. 
Head 3.55 to 4; depth 3.1 to 5.35; D. 7 or 8; A. g or 10; scales 28 to 30. 
Body compressed; profile straight from snout to nape, then convex 
to dorsal; head flat above; snout short, 3.75 to 4.3 in head; eye 2.85 to 
3-34; interorbital 1.9 to 3; mouth small, cleft reaching about one-third 
the distance to eye; teeth in jaws pointed, in bands, the outer series 
somewhat enlarged; scales moderate, cycloid, extending forward to 
eyes; caudal peduncle strongly compressed, its least depth 1.45 to 2 in 
head; origin of dorsal in female over the posterior rays of the anal and 
about equidistant from posterior margin of eye and tip of caudal, or 
slightly nearer the former, in the male its origin is about midway between 
posterior margin of eye and base of caudal; caudal fin rounded; anal 
fin in female inserted somewhat nearer base of caudal than posterior 
margin of eye, its posterior margin concave at least in large examples; 
in the adult male the anal fin is inserted notably nearer tip of snout than 
base of caudal, the longest produced ray failing to reach base of caudal 
by about an eye’s diameter, 2 to 2.3 in length of body; the apex of the 
intromittent organ curved forward, the first produced ray with a spur a 
short distance below its apex which is directed downward and forward; 
ventral fins rather small, reaching vent in female, and past origin of anal 
in the male; pectoral fins reaching slightly past base of ventrals, 1.2 to 
1.9 in head. 
Color of female olivaceous; scales with pale margins, next to the 
margins is a dark area formed by dusky points; sides of caudal portion 
