148 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



movable teeth ; scales large ; dorsal fin inserted behind anal ; anal fin of 

 male placed well forward and modified into an intromittent organ ; 

 alimentary canal elongate, convoluted, not in definite coils, its length 

 about iX times the length of the fish. 



A group of small fishfes found in ditches and swamps of the warmer 

 parts of America. Viviparous. 



KEY TO THE SPECIES OF HETERANDRIA. 



a. Origin' of dorsal fin nearer base of caudal than PAGE 



base of pectoral fin; spots on sides about as 



large as orbit pleurospilus 148 



aa. Origin of dorsal fin midway between base of 



caudal and posterior margin of opercle ;. spots 



on sides about as large as pupil lutzi 148 



138. Heterandria pleurospilus (Giinther). 



Girardinus pleurospilus Giinther, Cat., vi, 355, 1866; Lago de 

 Duenas: Giinther, Fish. Cent. Amer., 486, pi. 77, fig. i, 1869; 

 Lago de Duenas, Guatemala. 

 Heterandria pleurospilus Jordan & Evermann, Bull. 47, U. S. Nat. 



Mus., 1896, 688. 



Southern Mexico and Central America, in west coast streams. (San 

 Geronimo.) 



Head 4%; depth 3^; D. 7 or 8; A. 7 or 8; scales 8-28. Body 

 rather robust, compressed posteriorly; head broad; interorbital area 

 'nearly flat, 1% in head; snout 4 in head; eye 3; origin of dorsal fin 

 slightly behind that of anal, nearer base of caudal than base of pec- 

 toral fin; pectoral equals length of head; ventral if in head; caudal 

 fin slightly truncate; caudal peduncle rather deep, its least depth i^ 

 in head. 



Color light brownish, sides with 8 to 1 1 black spots on sides, each 

 about as large as eye ; some being broken up in two or more spots ; a 

 few specimens with a partial second row; fins all plain. Length about 

 2X inches. 



A well marked species. 



139. Heterandria lutzi Meek. 



Heterandria lutzi Meek, Field Col. Mus. Pub. 65, 1902, 106; Oaxaca; 

 Cuicatlan ; Venta Salada. 



Rivers of southern Mexico on both sides of the divide. (Motzorongo ; 

 Otopa; El Hule; Perez; Tehuantepec.) 



Head 4^; depth 3^; D. 7; A. 8; scales 8-29. Body elongate, 

 rather slender; head depressed anteriorly, giving it a wedge-shaped 



