Jordan and Evcrmann. Fishes of North America. 695 



1029. P(ECILIA DOVII, Giintlu r 



Head 3? ; depth 3f. D. 9; A. 8; scales 26 to 29-9. Width of interor- 

 bital space rather less than distance between front margin of eye and 

 gill opening. Eye somewhat more than length of snout, 3| in head, 

 and rather more than half width of interorbital space. Origin of 

 dorsal fin midway between root of caudal and occiput, over twelfth 

 scale of lateral series ; origin of anal opposite the second or third ray of 

 the dorsal (in the female); dorsal fin of moderate size; anal small; 

 caudal scaly on its basal third. Tail compressed, rather high, its least 

 depth equal to length of head without snout. Seven longitudinal series 

 of scales on each side of the tail. Uniform brownish green on the head 

 and body ; male with the dorsal fin slightly elevated, but the longest 

 ray is scarcely as long as the head without snout; this fin is orna- 

 mented with small, round, black spots. Anal fin modified into an 

 iiitromittent organ, and advanced to between the ventrals and in 

 front of the dorsal. Tail strongly compressed, but not higher than in 

 the female. Caudal fin with minute black spots on the interradial mem- 

 brane ; back of tail sometimes with indistinct, narrow, dark crossbars. 

 The female has the fins colored as in the male. Length 2^ inches. Mexico 

 and Guatemala. (Giinther.) (Named for John M. Dow, its discoverer.) 



Fiecilia tlorii, GuNTHEB, Cat., vi, 344, 1866, Lake Nicaragua; Lake Amatitlan. (Coll. Dow.) 

 Gambusiaplurnbea,* TROSCHEL, in Muller's Eeise in Mexico, in, 640, 1865, Mexico, no locality. 



1030. PCECILIA COUCHIANA (Girard). 



Head 5 in total with caudal ; eye 3 in head. D. 9 ; A. 6. Body short, 

 back convex; head small; scales very large. Dorsal longer than high, 

 inserted nearer base of caudal than tip of snout; anal opposite its hinder 

 portion; pectorals not reaching ventrals. Brownish, each scale with a 

 large brown spot; an obscure black lateral band ; fins plain, except the 

 dorsal, which has a few black spots. Known from females only. Rio 

 San Juan, at Cadareita and Monterey, in Nuevo Leon. (Girard.) 

 (Named for Lieut. D. N. Couch, of the Mexican Boundary Survey.) 



Liiuia'coucltiana, GIRARD, Proc. Ac. Nat. Sci. Phila., 1859, 116, Rio San Juan. (Coll. Couch). 



Pcecilia cmtchii, GUNTHER, Cat., VI, 347, 1866. 



Poecilia couchiana, JORDAN & GILBERT, Synopsis, 348, 1883. 



1031. PCECILIA BOUCARDI,t Steindachner. 



Head 3| ; depth 3. D. 9 or 10 ; A. 9 ; scales 27 or 28-9. Eye 3^ in head, 

 as long as snout; interorbital width 1 in head. Dorsal in females 

 inserted an eye's diameter nearer base of caudal than opercle, farther 



* Gambusia plumbea: D. 10; A. 9; P. 14. Length 2% inches. Greatest height more than 

 length of head, 4% in total length. Insertion of dorsal nearer caudal than tip of snout, over 

 tip of pectoral and end of anal, % depth of body below it; anal in male % height of body. 

 Brownish plumbeous, yellowish below; dorsal and caudal with many dark points, those on cau- 

 dal mostly near base. 



f A species allied to P. bowardi is mentioned as follows by Miiller & Troschel, Steindachner, 

 Monatsber. Akad. Wiss. Berl., 1844, 36: 



" Molinesiafasciata, MULLER & TROSCHEL: D. 8; A. 9; mit dunkeln Querbinden. Mexico." For- 

 tunately the name Puecilia fasciata is preoccupied. 



