152 Field Columbian Museum — Zoology, Vol. V. 



dorsal and anal pale orange, with many small round black dots; lower 

 fins pale; color of female similar to male, but paler; no cross bands; 

 a faint dark spot behind pectoral ; caudal nearly plain ; dorsal and anal 

 less spotted than in the male. Length about 3 inches. 



143. Poecilia presidionis Jordan & Culver. 



P cecilia presidionis Jordan & Culver, Proc. Cal. Acad. Sci., 1895, 

 413, pi. 29; Rio Presido, Sinaloa: Jordan & Evermann, Bull. 

 47, U. S. Nat. Mus., 1896, 697; Rio Presidio, Sinaloa. 



Fresh and brackish waters of Sinaloa. 



Head 4^; depth 3 % to 4^; D. 7 or 8; A. 7 ; scales 9-28. Body 

 rather elongate, the profile scarcely rising in front of the dorsal fin; 

 interorbital space broad, 2 in head; diameter of the eye equals the 

 length of the snout, 3^2 in head; teeth small, in two well separated 

 series; those of the inner row small, close set; origin of dorsal fin nearer 

 tip of caudal than tip of snout ; middle of dorsal over origin of anal (?) ; 

 fins all low and short; longest dorsal ray xVt, in head; pectoral 1% in 

 head; caudal truncate. 



Color (?) green sh above; sides with violet sheen; 3 or 4 black 

 cross-bars usually very distinct, sometimes obsolete in large examples; 

 one or two oblong spots before these in the place of other bars; last 

 ray of the dorsal with a trace of a dark ocellus; fins otherwise plain; 

 males without cross-bars and with the lower fins reddish. 



144. Poecilia couchiana (Girard). 



Limia couchiana Girard, Proc. Acad. Nat. Sci. Phila., 1859, 116; 

 Rio San Juan at Cadereita, near Monterey, Nuevo Leon. 



Poecilia couchiana Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 

 1896, 695. 



Headwaters of the Rio San Juan, near Monterey, very abundant 

 in a large spring in the city of Monterey. (Monterey.) 



Head 3^; depth 3; D. 9; A. 7 or 8; scales 10-27. Body robust, 

 moderately, compressed ; back moderately elevated, head small, inter- 

 orbital 1 1 in head ; teeth loose , in one series ; snout 3 ]4 ', eye 3 ; origin 

 of dorsal fin much in advance of anal, midway between base of caudal 

 and eye; pectoral fin 1% in head; ventral i| in head; caudal fin 

 rounded; caudal peduncle 1 ^ in head; alimentary canal elongate, 

 coiled on the right side. 



Color dark brownish on upper two^thirds of body; below white, 

 with a few black specks; each scale on upper half of body with light 

 centers. Length about 1% inches. 



One female 1.75 inches in length contained 22 eggs. The young 

 are probably born early in June. 



