JULY, 1907. FISHES OF GREAT LAKES, NICARAGUA MEEK. 113 



a. Intestinal canal comparatively short, usually about the length 



of the body; teeth not movable. Paragambusia 113 



aa. Intestinal canal comparatively elongate, usually coiled on the 



ventral and right side ; teeth movable. Poecilia 113 



Genus Paragambusia Meek. 



Paragambusia nicaraguensis (Gunther). 



Gambusia nicaraguensis Gunther, Cat., vi, 336, 1866, Lake Nicara- 

 gua: Gunther, Fishes Cent. Amer., 483, PI. LXXXII, fig. 3, 1869, 

 Lake Nicaragua: Gill & Bransford, Proc. Acad. Nat. Sci., 

 Phila., 1877, 187. 



Head 3.5; depth 2.5; D. 6; A. 10; scales 10-26. Body much 

 compressed; head small, depressed; interorbital flat, 1.7 in head; 

 snout 3.3 ; diameter of eye 3 ; origin of dorsal fin (9 ) almost entirely 

 behind anal, its distance from base of caudal 2 in its distance from 

 tip of snout; anal fin of female with its first 3 or 4 rays produced and 

 falciform, the longest ray equaling distance from tip of snout to base 

 of pectoral fin; pectoral fin equaling length of head; ventral 2 in 

 head, one of its rays slightly produced; peritoneum black; alimentary 

 canal less than the length of the fish. 



Color light brownish; dorsal and caudal fins spotted with black 

 dots ; in the larger females the produced anal rays are black ; a dark 

 bar downward and backward from eye. This fish reaches a length of 

 about 25 mm. 



This species is known from the Atlantic streams of the Isthmus of 

 Tehuantepec, the Rio Montagua in Guatemala, and Lake Nicaragua. 

 No individuals of this species were taken by me in Nicaragua. 



Genus P<Ecilia Bloch & Schneider. 

 One species of this genus occurs in the lake. ' 



Poecilia sphenops (Cuvier & Valenciennes). JULUMINA. 



Pcecilia dovii Gunther, Cat., v, 344, 1866, Lake of Nicaragua; 

 Lake Amatitlan, Guatemala: Gill, Proc. Acad. Nat. Sci., Phila., 

 1877, I ^7> Lake Nicaragua. 



Head 3.5 to 4.4; depth 2.8 to 3.4; D. 8 to 10; A. 8 or 9; scales 

 9 to 1 1-25 to 29. Body robust, compressed ; back not much elevated ; 

 interorbital area nearly flat 1.7 to 1.8 in head ; snout 2.2 to 4.5 in head ; 



