49. CYPRINODONTID^ GAMBUSIA. 345 



normal. Scales large. Dorsal and anal fins both rather short, the anal 

 more or less in advance of the dorsal ; anal fin of the male modified into 

 a long intromittent organ, and much advanced. Intestinal canal short. 

 Branchiostegals 6. Small fishes inhabiting "the fresh waters of Mexico, 

 Cuba, and the Southern States. The numerous species are imperfectly 

 known. 



("The name owes its etymology to the provincial Cuban word Gambusino, which 

 signifies nothing, with the idea of a joke or farce. Thus one says 'to fish for Gambu- 

 sinos' when one catches nothing." Poey.) 



562. <J. palrucfiis (B. & G.) Girard. 



Snout broad, subspatulate, the lower jaw projecting. Eye longer 

 than snout, 3 in head, 1 in interorbital space. Anal process in $ 

 longer than head, not curved at its extremity. Caudal peduncle rather 

 elongate. A faint dark line across upper part of trunk; sometimes 

 series of dark dots on sides of body; an oblique dark band below orbit; 

 caudal with dark spots; coloration sometimes uniform. Head 3|; 

 depth 4. D. S; A. 9; scales 32-8. .South Carolina to Mexico; abun- 

 dant in lowland streams. 



(Heterandria holbrooki Agassiz MSS. : Gambusia holbrooki Girard, Proc. Acad. Nat. 

 Sci. Phila-. 1859, 61 : Gambusia holbrooki Giiuther, vi, 334 : Heterandria patrucUs B. & 

 G. Proc. Acad. Nat. Sci. Phila. 1853, 390; Girard, U. S. Mex. Bound. Surv. Ichth. 72.) 



563. tr. Iiiisnalis Giinther. 



Slender; anal larger than dorsal, and much anterior to it. Olive; 

 dorsal and caudal with narrow blackish cross-bars. Head 4^. D. 6; 



A. 9. Matamoras. (Girard.} 



(Gambusia gracilis Girard, Proc. Acad. Nat. Sci. Phila. 1859, 121, preoccupied; 

 Giinther, vi, 335.) 



564. r. arlingloiiia, Goode & Bean. 



Uniform brownish olive; fins with a few blackish dots. Snout 

 broad. Lower jaw projecting. Eye longer than snout, 3 in head. Dor- 

 sal inserted midway between posterior margin of eye and tip of tail. 

 Pectorals reaching ventrals ; ventrals to vent. Head 3J; depth 4. D. 

 9; A. 11; V. 6; Lat. 1. 33; L. transv. 11. Arlington Eiver, Florida; 

 known from females only, and very likely a Zygonectes. 



(Goode & Bean, Proc. U. S. Nat. Mus. 1879, 118.) 



losed together. Mandible long, somewhat prominent ; both jaws with a broad baud 

 of cardiform teeth. Scales rather small. Anal in advance of dorsal, modified in the 

 male into an intromittent organ. Branchiostegals 6. Intestinal canal short. Car- 

 nivorous. Mexico. (Belone; Esox.) 



B. belizanus Kner. . 



Slender. Olivaceous; sides with series of brown dots ; a black spot at root of caudal. 

 Head 3 ; depth 5^. D. 9; A. 10; scales 60-18. Mexico and Central America. (Kner.) 

 (Kner, 1. c.; Giinther, vi, 333.) 



