GOODEA.— G-AMBUSIA. 93 



in the length of head ; iiiterorbital width equal to or a little longer than the postorbital part of head. 

 32 to 35 scales in a longitudinal series. Dorsal 16-18 ; origin equidistant from snout and base of caudal 

 ( c? ) or nearer the latter ( J ). Anal 14-16 ; origin posterior to that of the dorsal. Pectoral |-4 the 

 length of head. Caudal truncate or subtrunoate. Olivaceous ; a dark spot on each scale of the upper 

 and posterior parts of the body ; a dark vertical bar at the base of the caudal fin ; dorsal and caudal fins 

 with dark spots. 



Hab. Mexico, Rio Lerma System : 

 Jalisco 1 ; Lake Chapala ^. 



Here described from four specimens, measuring up to 50 mm. in total length, from 

 Ocotlan {Meeh). 



9. BELONESOX, Kner, 18G0. 



Belonesox, Glinth. Cat. Fish. vi. p. 333 (1866) ; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, 

 p. 684. 



Viviparous. Anal fin, in the male, advanced and modified into an intromittent organ. Mouth large, with 

 extended lateral cleft ; teeth in bands, slender, pointed, depressible. 



This genus comprises a single species, quite unlike any other member of the family. 



1. Belonesox "belizanus. 



Belonesox belizanus, Kner, Sitzungsb. Al;;. Wien, xl. 1860, p. 419, fig/ ; Giinth. Cat. Fish. vi. p. 333 

 (1866) - ; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 684'; Meek, Publ. Columbian 

 Mus., Zool. v. 1904, p. 135 \ 



Depth of body 4 to 6 in the length, length of head nearly 3. Snout 2^ to 3| as long as eye, the diameter of 

 which is 5 to 6 in the length of head. Lower jaw more than i the length of head. 55 to 65 scales in 

 a longitudinal series. Dorsal 9-10. Anal 10-12, in advance of the dorsal. Caudal rounded. A small 

 dark spot on each scale of the upper part of the body ; a blackish spot at the base of the caudal. 



Ilah. Mexico, Boca del Eio ^ Otopa *, El Hule *, Obispo *, and Perez -^ in Vera Cruz ; 

 Bkitish Hondukas, Belize i ; Guatemala, Lake Peten -. 



Here described from eight specimens, measuring up to 200 mm. in total length, from 

 Perez {Meek), Lake Peten (Salvin), and Belize. The largest males measure 90 mm. 



10. GAMBUSIA, Poey, 1855. 

 Pseudoxiphophorus and Gambusia, Gunth. Cat. Fish. vi. pp. 332 and 333 (1866) ; Jord. & Everm 



Bull. U.S. Nat. Mus. xlvii. 1896, p. 678. 

 Viviparous. Anal fin, in the male, advanced and modified into an intromittent organ. Mouth small 

 moderate ; rami of lower jaw firmly united; small teeth in bands, with an outer series of more or loss 

 enlarged, conical, fised teeth. 



This genus comprises ten species from the Southern United States, Mexico, and 

 Central America, and three or four from Cuba and Jamaica. 



or 



