324 Field Museum of Natural History — Zoology, Vol. X. 



40. Genus Poeciliopsis Regan. 



PcBciliopsis Regan, Proc. Zool. Soc. London, 19 13, 996 (type Pcecilia 



presidionis Jordan & Culver). 



Body elongate, compressed; head more or less depressed; mouth 

 small, the cleft transverse; teeth in the jaws in 2 series or bands, de- 

 pressable, the outer ones largest, slightly compressed; the intromittent 

 organ long and slender, without hooks or serrations at apex; ventral 

 fins not modified in the male. 



KEY TO THE SPECIES. 



a. The three produced rays of anal, as well as both branches of the 

 second, all of about equal length and reaching to apex of intro- 

 mittent organ, failing quite notably to reach base of caudal when 

 defliexed; no dark area over vent; young of 60 mm. and less in 

 length with dark cross-bars on posterior part of body; fins un- 

 marked, elongatus, p. 324. 

 aa. The first and the anterior branch of the second produced ray of 

 anal fin in male of about equal length and extending to apex 

 of intromittent organ, the posterior branch of the second 

 and the third produced ray notably shorter; intromittent 

 organ when deflexed reaching nearly or quite to base of caudal; 

 a dark area over vent; indistinct cross-bars on body; fins dusky, 

 the dorsal with blackish basal band and dark edge. 



isthmensis , p. 325. 

 61. Poeciliopsis elongatus (Giinther). 



Pcecilia elongata Gunther, Cat. Fish. Brit. Mus., VI, 1866, 342 (Panama), 



and Trans. Zool. Soc. London, VI, 1869, 484, PI. LXXXV, fig. 2 



(Panama); Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 



1896, 697; Gilbert & Starks, Mem. Cal. Ac. Sci., 1904, 50 (Brackish 



sloughs about Panama) ; Regan, Biol. Cent. Amer., Pisces, 1907, 102. 



MolliemsiaelongataRegan,'Pvoc.Zool. Soc. London, 1913, 1013 (Panama). 



IHeterandria colomhianus Eigenmann & Henn, Indiana Univ. Studies, 



No. 16, 1912, 27 (Rio Dagua, Colombia); Regan, Proc. Zool. Soc. 



London, 1913, 996. 



IPoeciliopsis colomhianus Henn, Ann. Carnegie Mus., X, 1916, 120 



(Rio Dagua, Colombia). 



Head 3.4 to 4.4; depth 3.4 to 4; D. 8 to 10, usually 9; A. 8 or 9; scales 

 28 to 33. 



Body elongate, robust, posteriorly compressed; head depressed, flat 

 above; snout broad, 3.8 to 4.55 in head; eye 3.33 to 4.6; interorbital 2 

 to 2.2; mouth transverse; teeth in outer series close-set, slightly com- 



