8o Field Columbian Museum— Zoology, Vol. III. 



Specimens in our collection are from the following localities: 

 Colonia Juarez; Santa Maria; Guzman; Chihuahua; San Andres; 

 Santa Rosalia; Jimenez: Miiiaca. 



Gila minacae, sp. nov. 



Type, No. 3573. F. C. M. Length, 4.46 inches. 



Locality, Mihaca. Rio Paphigochic, Minaca, Chihuahua, 

 Mexico. 



H.ead 3|: depth 4|; D. 9; A. 8; scales 24-go-ii. Body elon- 

 gate, back not arched; snout bluntish; mouth terminal, rather 

 large, maxillary reaching anterior margin of pupil, its length 3^ 

 in the head: snout 3|; eye 4I; body completely scaled; origin of 

 dorsal slightly behind origin of ventrals, midway between base of 

 caudal and anterior margin of orbit; base of dorsal 2 in head, 

 its longest ray i^ in the head; the tips of all of the dorsal rays 

 together when the fin is deflexed, and fall opposite to the middle 

 of base of anal fin; tips of pectorals reaching | distance to ven- 

 trals, length i^ in head: tips of ventrals reaching to vent, 

 length 1 1 in head; caudal fin forked, the upper lobe the 

 larger; lateral line complete, decurved, its lowest part over space 

 between tip of pectorals and ventral fins, reaching axis of body 

 on posterior half of caudal peduncle. A row of pores from nos- 

 tril to nape, a second row from nostril forward a short distance, 

 then curving downward and backward under eye near upper angle 

 of opercle; caudal peduncle very slender, nearly terete, its least 

 depth 3I in the length of the head. 



Color, light olivaceous, a faint dark band from base of caudal 

 to opposite first dorsal rays; fins all plain; a very faint caudal spot. 



This species resembles G. elegans, from which it differs in the 

 shorter anal and pectorals, the more robust caudal peduncle, 

 absence of hump before the dorsal fin, and the longer head. 



This or another species of Gila is found in the Carmen River 

 system. Mihaca. 



Lenciscus nigrescens (^Girard). 



This species is very abundant in Northern Mexico. It is very 

 variable. Scales in the lateral line vary from 66 to 75. The 

 larger specimens (9 to 1 1 inches in length) are of a uniform dark 

 color and without the black lateral band. In smaller individuals 

 (2 to 4 inches in length) the color is lighter and the dark lateral 

 band is very prominent and ends in a rather indistinct spot at 

 base of the caudal fin. Specimens from Chihuahua, Santa Maria, 



