CYPRIi^ODONT FISHES. 995 



8. Heterandria, Agass., 1853. 



Amer. Journ. Sci. xvi. p. 135. 



Girardinus (part.) Giinth. Oat. Fish. vi. p. 351 (1866). 



Heterandria (part.) Garman, Mem. Mus. Comp. Zool. xix. 1895, 

 p. 90. 



Differs from Gamhusia and Priapichthys in the small transverse 

 mouth and compressed pointed teeth, the enlarged outer teeth 

 forming a close-set series. The intromittent organ is elongate, 

 as in Priapichthys, and its structure indicates a close relationship 

 to that genus. It differs in that the third prolonged ray is 

 scarcely longer than the posterior branch of the second, so that 

 the hook is supported only by the anterior branch of the second. 



Two species from the United States and Mexico. 



1. Heterandria FORMOSA. (Text-fig. 170 A.) 

 ReterandriaformosaAgPiSS. Amer. Journ. Sci. xix. 1855, p. 136 ; 



Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 91, pis. iv. fig. 7, 

 viii. fig. 8, and xi. figs. 1-3 ; Jord. & Everm. Bull. U.S. ISTat. Mus. 

 xlvii. 1896, p. 687. 



Girardhius formostis Giinth. Cat. Fish. vi. p. 354 (1866). 



Depth of body 3§ to 4 in the length, length of head 3| 

 to 4. Diameter of eye 3 to 3f in length of head, interorbital 

 width 2. 28 to 30 scales in a longitudinal series. Dorsal 7-8 ; 

 origin above middle of anal, scarcely nearer to end of caudal than 

 to tip of snout. Anal 10. A dark lateral band crossed by several 

 vertical bars ; , a blackish spot on basal part of dorsal, another on 

 anal. 



South Carolina to Florida. 



Eight specimens, the largest female 30 mm., the males 15 to 

 20 mm. in total length. 



2. Heterandria fasciata. 



Gamhusia fasciata Meek, Publ. Columbian Mus., Zool. v. 1904, 

 p. 129, fig. 37 ; Regan, Biol. Centr.-Amer., Pisces, p. 95 (1907). 



Very similar to the preceding in form and coloration, except 

 for the absence of the lateral band, differing especially in the 

 more posterior dorsal fin, its origin above end of anal and much 

 nearer to end of caudal than to tip of snout. Dorsal 8. Anal 

 9-10. 32 scales in a longitudinal series. 



Southern Mexico. 



Total length 55 mm. 



Six specimens from Oaxaca and Tequesixtlan (Gadow). 



The male of this species has not yet been described. 



9. Pseudopoecilia, gen, nov. 



Closely related to Heterandria, but with the teeth broad 

 truncated incisors and the intromittent organ somewhat different 

 in structure. 



