lOOG 3111. C. TATE REGAN OX 



■ Poecilia surinamensis Val. t. c. p. 158, pi. li. fig. 1 ; Cuv. & Val. 

 t. c. p. 120. 



Poecilia unimaculata Val. t. c. p. 1 58, pi, li. figs. 2,5,6; Cuv. k, 

 Val. t. c. p. 128 ; Giinth. t. c. p. 346. 



5 . Depth of body 2|^ to 4 in the length, length of head 3|- to 4|-. 

 Diameter of eye 3 to 4 in length of head, interorbital width 

 1| to 2. 25 to 27 scales in a longitudinal series. Dorsal 7-9 ; 

 origin nearly a,bove that of anal and equidistant from some part 

 of operculum and base of caudal. Anal 8-10. Pectoral a little 

 shorter than head ; pelvics reaching vent. Least depth of caudal 

 peduncle -| to 4 length of head. Olivaceous ; edges of scales usually 

 darker ; body often with dark cross-bars ; often a blackish spot, 

 which may be pale-edged, on upper part of side 2 or 3 scales in 

 front of dorsal fin ; often a pair of blackish spots at base of caudal 

 above and below, extending along margins of fin ; fins sometimes 

 immaculate, but dorsal and caudal sometimes with series of small 

 spots, or dorsal with one or two blackish bands, 



(^ . Dorsal a little further forward and higher than in 5 • 



Venezuela and Leewaxd Islands to the La Plata. 



ISTumerous examples, the largest female 80 mm. and the 

 largest male 60 mm, 



2. PcECiLiA PAR^. (Text-fig. 173 B.) 



Poecilia vivipara paro} Eigenm. Ann. N.Y. Acad. vii. 1894, 

 p. 629. 



? Poecilia amazonica Garman, Mem. Mus. Comp. Zool. xix. 

 1895, p. 64. 



Acanthophacelus hifurcus Eigenm. Mem. Carnegie Mus. v. 

 1912, p. 459, pi. Ixv. figs. 4-6. 



5 . Depth of body 3-1- in the length, length of head 3-|-. 

 Diameter of eye 3^ in length of head, interorbital width 2. 28 

 scales in a longitudinal series. Dorsal 6 ; origin above posterior 

 end of anal, neai-ly equidistant from head and base of caudal ; 

 middle rays longest, 1 length of head. Anal 8-9. Pectoral | 

 length of head ; pelvics extending to origin of anal. Least 

 depth of caudal peduncle y length of head. Olivaceous ; usually 

 a pale lateral stripe ; a vertically expanded dark spot with pale 

 margin on upper part of side, nearly equidistant from head and 

 dorsal fin ; fins immaculate. 



(S . Dorsal origin nearer to head than to base of caudal ; 

 longest rays f length of head. A dark spot above pectoral (as in 

 $ ), a. larger one just- above anal fin, a third on caudal peduncle ; 

 dorsal and caudal sometimes spotted, latter with dark upper edge. 



Amazon ; Guiana. 



Four specimens, two females of 28 mm. and two males of 22 

 and 24 mm. in total length, received from Prof. Eigenmann ; 

 these a.re co-types of the species from Para and of A. hifurc^is 

 from British Guiana. The intromittent organ is figured 

 (text-fig. 173 B). 



Garman 's description of P. amaxonica applies to P. ^;«rrt?. 



