MAY, 1902. THE ICHTHYOLOGY OF MEXICO MEEK. 113 



slightly reduced in size. Origin of spinous dorsal over middle 

 of ventrals and being nearer tip of snout than base of caudal 

 by a distance greater than diameter of eye; eye 3?; length of 

 pectoral fin i in head; ventral 2^; base of anal i3; gill-rakers 

 4-j-i8 22: vertebrae 23-^-20=4.3. 



Light olivaceous, translucent; smallest specimens (2^ inches 

 in length) darker, more opaque: silvery band on sides narrow, 

 inconspicuous under the pectoral tin, being widest on anterior 

 part of the caudal peduncle. 



Species of small size, common in Patzcuaro Lake.. This 

 species is characterized by large scales, the anterior position of 

 the dorsal fins, the short anal fin, and 'the long slender caudal 

 peduncle. Patzcuaro. 



Chirostoma labarcae, sp. nov. 



Type, No. 3640, F. C. M. Length, 3.68 inches. 



Locality, Rio Lerma, at La Barca, Jalisco, Mexico. 



Head 34; depth 4^; D. iv-io: A. 21; scales 41-11. Body 

 slender, compressed; snout rather long, pointed, its length 

 2* in length of the head; lower jaw slightly the longer; eye 3! 

 in head; interorbital 3; mouth moderate, not very oblique, 

 maxillary reaching slightly beyond anterior margin of the eye; 

 length of the mandible 2^ in head: a single series of large teeth 

 - in each jaw, a few smaller teeth behind these, a few near tip 

 of jaws large and canine-like. Scales large with edges entire, 

 those on the nape very slightly reduced in size; origin of spinous 

 dorsal over vent, midway between base of caudal and pupil; 

 base of anal fin equals length of head, its rays 20 to 21; length 

 of pectoral fin i in the length of the head; ventral fins 2 in 

 head; gill-rakers 4+13=17. 



Light olivaceous, translucent; a few dark dots on margins of 

 scales on upper half of body; lateral band narrow, the portion 

 under the edge of the pectoral indistinct, and made up of a 

 few dark dots. 



Species of small size, the longest 3| inches in length. This 

 species differs from others with large scales in having a longer 

 snout, the posterior position of dorsal fins, the long anal fin and 

 the strong dentition. Apparently scarce. La Barca; La Palma. 



Chirostoma jjatzcuaro, sp. nov. 



Type, No. 3628, F. C. M. Length, 3.68 inches. 



Locality, Lago de Patzcuaro, Patzcuaro, Michoacan, Mexico. 



