CYPRIXODONT FISHES. 991 



2 to 2i. 30 or 31 scales in a longitudinal series. Dorsal 9 ; 

 origin above middle of anal, equidistant fi-om opei'culum and base 

 of caudal ; longest rays nearly ^ length of head. Anal 10; first 

 branched ray longest. Pectoral |- length of head ; pelvics reaching 

 vent. Least depth of caudal peduncle ^ length of head. Oliva- 

 ceons ; scales dark-edged ; a dark bar below eye ; dorsal fin with 

 two series of dark spots ; caudal faintly spotted. 



Grand Cayman. 



Two females, 22 and 26 mm. in total length. 



4. Belonesox Kner, 1860. 



Sitzungsb. Akad. Wien, xl. p. 419, 



Related to Gambasia, but the jaws produced, with broad bands 

 of slender, pointed, depressible teeth. Aiaal fin of male very 

 similar to that of Gambusia, differing in that the terminal seg- 

 ments of the first produced ray are not serrated, while rather 

 small retrorse spines at the ends of the third and the posterior 

 branch of the second produced rays represent the hooks of 

 Gafiihusia. 



A single species. 



Belonesox belizanus. (Text-fig. 169 E.) 



Belonesox belizamcs Kner, Sitzungsb. Akad. Wien, xl. 1860, 

 p. 419, fig.; GLinth. Cat. Fish. vi. p. 333 (1866); Meek, Publ. 

 Columbian Mus.,Zool. v. 1904, p. 135; Began, Biol. Centr.-Amer., 

 Pisces, p. 93 (1907). 



Depth of body 4 to 6 in the length, length of head nearly 3. 

 Snout g the length of head. 55 to 65 scales in a longitudinal 

 series. Dorsal 9-10. Anal 10-12, in advance of dorsal. 



Atlantic Slope of Yera Cruz, British Honduras, and Guatemala. 



The largest species of the group, the males attaining 100 mm., 

 the females 200 mm. in total length. Here described from ten 

 specimens from Perez, Belize, and Lake Peten. 



5. Priapichthys, gen. nov. 



Differs from Gambusia in that the intromittent organ is longer, 

 when laid back nearly reaching the caudal fin, and is quite 

 differently formed ; the terminal part is hooked forward and the 

 prolonged rays taper distally and have no specially modified 

 segments, except the usual serr?e of the posterior branch of the 

 second ; the first prolonged ray does not extend to the apex, and 

 the hook is supported by the anterior bi-anch of the second and 

 the third (text-fig. 170 *B). 



It is here assumed thali five species from Central America and 

 Colombia are congeneric with P. a7inectens, the only species of 

 which I have examined males ; in all but F. parismina males are 

 known and agree with those of P. annectens in their long intro- 

 mittent organ. 



66* 



