J74 



FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



160. Chirostoma patzcuaro Meek. 



Chirostoma patzcuaro Meek, Field Col. Mus. Pub. 65, 1902, 113; 



Patzcuaro. 

 Basin of the Rio Lerma. 



FIG. 56. CHIROSTOMA PATZCUARO Meek. 



No. 3628, Field Columbian Museum. 



Head 4%; depth 5^; D. v-io; A. 17 ; scales 12-48. Body slender, 

 moderately compressed; mouth oblique; snout short, pointed, its 

 length 3 ^in length of head ; lower jaw slightly projecting beyond upper 

 mandible, 2% in head; diameter of eye 3%" in the head; teeth small, 

 numerous, in a narrow band on anterior part of each jaw, becoming 

 laterally, in two series ; origin of spinous dorsal slightly nearer tip of 

 snout than base of caudal ; base of anal fin i % in length of the head ; 

 pectoral 1^2', ventral 2^"; scales moderately large, edges entire, those 

 at the nape slightly reduced in size; gill rakers 4+21 = 25. 



Color light olivaceous, translucent; lateral band narrow. Length 

 about 4 inches. 



This species resembles Chirostoma chapala, from which it differs 

 in having a less oblique mouth, a shorter anal fin, and a less com- 

 pressed body. At present it is known only from Lago de Patzcuaro, 

 where it is apparently scarce. 



161. Chirostoma zirahuen Meek. 



Chirostoma zirahuen Meek, Field Col. Mus. Pub. 65, 1902, 114; 



Zirahuen. 

 Basin of the Rio Lerma. 



FIG. 57. CHIROSTOMA ZIRAHUEN Meek. 

 No. 3609, Field Columbian Museum. 



