PACIFIC FRESH WATER FISHES. 26l 



grooved grinding surface. Scales very small, about 17— 

 70 to 80-14, lateral line incomplete posteriorly. Alimen- 

 tary canal 1% times length of body; peritoneum black. 

 Dorsal inserted behind ventrals, the latter reaching the 

 vent. Anal deep, extending when depressed half way 

 from its hinder margin to caudal. 



Color of Hermosillo specimens, in alcohol, a dark me- 

 dian dorsal stripe, a dark lateral band, above which the 

 sides are brown; under parts silvery; sides in and above 

 the lateral band finely dusted with black; a distinct black 

 spot at base of caudal; fins all pale. The specimens col- 

 lected by Mr. Price have lost their color markings. 



6. Pcecilia occidentalis (Baird & Girard). 



Numerous specimens from the Yaqui, east of Oposura, 

 collected by Mr. Price, and from Hermosillo, collected 

 by Dr. Eisen. The following description is based on the 

 latter, those collected by Mr. Price not differing mate- 

 rially. This species, as Mr. Garman has shown, is a true 

 Pcecilia, not a Heterandria: 



Dorsal 7 or 8; anal 7; ventral 6. Scales 28-7. Head 

 3% to 4 in length, depth 3^ to 4. Eye 3^ in head, equal 

 to or slightly longer than snout, a little less than two times 

 in interorbital width. Teeth in a double crescentric row 

 in each jaw, with a series of minute teeth behind them, 

 not readily appreciable. Origin of dorsal in middle of 

 total length in females, more anterior in males; behind 

 the anal in males, where it is nearer pectorals than cau- 

 dal, above posterior rays of anal in females. Anal pro- 

 cess i| to 2 times head, in some specimens extending to 

 caudal, bent to one side at its extremity with minute ser- 

 rulations. Adult males have the ventral fins very small 

 and placed almost below the pectorals; the females have 

 them larger and inserted below the tips of the pectorals.. 



