108 HAPLOM]. 



Hab. Southern Mexico, Cordova'-^" [Boucard), Otopa ^5, Motzorongo'^ Refugio^'', 

 El Hule •''j Obispo-'', Sanborn '\ Oaxaca [Gadow'^). 



Several specimens, measuring up to 100 mm. in total length. 



4. Xiphophorus guentheri. 



Xiphophorus helleri (part.), Giiuth. Cat. Pish. vi. p. 349 (1866) ', and Trans. Zool. Soc. vi. 1868, 



p. 485, t. 87. figs. 2-.5 "-. 

 Xiphophorus guentheri, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 702 \ 



Depth of body 3-3^ in the length, length of head 4;^. 28 or 29 scales in a longitudinal series. Dorsal 13-14. 

 Anal 9-10. Dorsal rays, in the males, increasing in length throughout. Least depth of caudal peduncle 

 nearly equal to the length of head. Olivaceous, -with brownish longitudinal stripes or series of spots 

 along the rows of scales. 



Hah. Guatemala, Rio Chisoy ^ - {Godman and Salvin). 



Here described from eight specimens, measuring up to 100 mm. in total length. 

 Jordan and Evermann gave a name to this form because they considered the dark 

 irregular blotches on some of the specimens figured by Giinther were a specific 

 character. This is not the case, for in this, as in many other species of the family, the 

 dark spotting or marbling is found only on some individuals. 



5. Xiphophorus brevis. (Tab. XIV. figg. 8, 9.) 



Xiphophorus brevis, Eegan, Ann. Mag. Nat. Hist. (7) xix. 1907, p. 65 '. 



Depth of body ~l-~% in the length, length of head 3;:^-3|. 27 scales in a longitudinal series. Dorsal 13- 1. j. 

 Anal 9-10. Least depth of caudal peduncle nearly equal to the length of head, equal to the distance 

 from end of dorsal to base of caudal. Olivaceous ; 3 or 4 indistinct darker longitudinal stripes at the 

 edges of the series of scales on the sides of the body. 



Ilab. Bkitish Honduras, Stanu Creek (Robertson) i. 



Here described from two specimens, male and female, 70 and 75 mm. in total 

 length. 



16. ANABLEFS, Bloch, 1795. 



Anableps, Giinth. Cat. Fish. vi. p. 337 (1866). 



Viviparous. Anal fin, in the male, modified into an intromittent organ, covered with scales and witli a 

 terminal orifice. Mouth small or moderate ; teeth pointed, in bauds. Eyes placed high, each divided 

 into an upper and a lower portion, the former above the level of the rest of the head. Dorsal fin short 

 with 8-12 rays, posterior in position ; anal with 10-12 rays, in advance of the dorsal. 



This remarkable genus comprises three species, two of which arc restricted to the 

 rivers of tropical South America. 



1. Anableps dovii. 



Anableps dowei, Gill, Proc. Ac. Philad. 1864, p. 4". 



Anableps dovii, Giinth. Cat. Fish. vi. p. 338 (1866j'; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 



1896, p. 685 '; Meek, Publ. Columbian Mus., Zool. v. 1904, p. 136 '. 

 Anableps dowii, Garm. Mem. Mus. Comp. Zool. xix. 1895, p. 79 '. 



