170 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



specimens were gotten in the markets, having been sent there 

 from the Lerma basin. 

 Basin of the Rio Lerma and the Valley of Mexico. (Viga Canal.) 



FIG. 52. CHIROSTOMA JORDANI Woolman. 

 No. 45572, U. S. National Museum. 



Head 3$ ; depth 4,5/3'; D. iv, 8 or 9; A. 16 to 18; scales 37 or 38. 

 Body elongate, moderately compressed; snout short, its length 4 in 

 head; mouth small, very oblique, the maxillary scarcely reaching an- 

 terior margin of the eye; teeth minute; diameter of eye 3^ in the 

 head ; origin of spinous dorsal midway between base of caudal and 

 anterior margin of the orbit ; anal fin long, its base slightly longer than 

 head ; scales with entire edges ; pectoral fin i ^ in the head ; ventral i g ; 

 scales at the nape not much reduced in size. 



Color light olivaceous ; a narrow blue stripe on sides ; edges of scales 

 on upper half of body with black dots. Length about i 1 /* inches. 



This species is smaller, more abundant, and more widely distributed 

 than any other member of the genus. It, with the other small species 

 and the young of the larger ones, is dried and shipped in large quan- 

 tities to the larger cities, where it is used for food. 



155. Chirostoma mezquital sp. nov. 



Type, No. 4389, F. C. M., 2^ inches in length; Durango, Du- 

 rango. 



FIG. 53. CHIROSTOMA MEZQUITAL Meek. 



