14. GAMBUSIA. 333 



2. Pseudoxiphophorus reticulatus. 



Pseudoxipliophorus reticulatus, Troschel, in M'uUers Reis. Mex. iii. 

 App. p. 104. 



D. 16. A. 8 (male). 

 Known from a male only. 



The height of the body is one-sixth of the total length (with the 

 caudal) ; anal process without hooks. The pectoral extends to the 

 end of the base of the anal. Coloration as in the preceding species ; 

 caudal fin entirely blackish. {Trosch.) 



13. BELONESOX. 



Belonesox, K?ier, Sitzc/sber. Akad. Wiss. Wien, 1860, xl. p. 419. 



Cleft of the mouth much developed laterally, the jaw-bones being 

 much produced ; the intermaxiUaries form together an elongate tri- 

 angular plate, but are not anchylosed together. Mandible long, 

 somewhat prominent ; both jaws with a broad band of cardiform 

 teeth. Scales of moderate size. Anal in advance of dorsal, and 

 modified into an intromittent organ in the male. Intestinal tract 

 short. Carnivorous. 



Central America. 



1. Belonesox belizanus. 



Kner, I. c. (c. tab.). 



B. 6. D. 9. A. 10-11. V. 6. L. lat. 56-63. L. transv. 18. 



The height of the body is one-sixth or rather more than one-fifth 

 of the total length (^vithout caudal), the length of the head one- 

 third or more than one-thii'd ; the upper siu"face of the intermax- 

 illary plate is as long as the postorbital part of the head. The 

 length of the base of the dorsal fin is more than one-half of its dis- 

 tance from the caudal in males, and one-half in females. Brownish 

 olive above ; sides with longitudinal series of black dots ; a round 

 black spot on the root of the caudal. 



The anal process of the male is composed of three rays, and two- 

 thirds as long as the head. 



Honduras ; Mexico ; Guatemala. 

 a-b. Males, 4 and 2g inches long. Mexico. Prom M. Salle's Collection. 

 c. Female. Mexico. From Mr. Cuming's Collection. 

 d-e. Females, 7 inches long. Lake Peten. From Mr. Sahin's Col- 

 lection. 



14. GAMBUSIA*. ^ 

 Gambusia, Poeij, Mem. Cub. i. 1851, p. 382. 



Cleft of the mouth developed laterally and horizontally ; -bwies 



* 1. Gambusia speciosa, Girard, Proc. Acad. Naf. Sc. Philad. 1859, p. 121. — 

 Rio San Diego, New Leon. 



2. senilis, Girard, 1. c. — Chihuahua River. 



3. gracilis, Troschel, in Midler, Eeise Mex. App. iii. p. 107. — Prof. 



Troschel has kindly informed me that this fish may prove to be a 

 Eividus, but, owing to the state of the specimen, it cannot be ascer- 

 tained whether it has an air-bladder or not. 



