FAMILY V. CYPRINID^E. 47 



Head 4; depth 4 to 4^; D. 8; A. 7; scales 16-65-10. Body 

 elongate, rather robust; snout rather blunt, 4 in head; mouth oblique; 

 lower jaw short included; maxillary scarcely reaching vertical from 

 anterior of eye,, its length 3^ in head; interorbital convex, 2^ in 

 head; eye 5 in head; origin of dorsal midway between tip of snout 

 and base of caudal; longest dorsal ray i^ in head; base of dorsal 

 2^ in head; 33 scales in a series between nape and dorsal fin; pectoral 

 if in head; ventral 1^3 in head; caudal fin forked, its length about 

 i^\ in head; gill rakers long and rather slender, 22 or 23 on the 

 first gill arch; lateral line complete, decurved. 



Color reddish, becoming lighter below, not much silvery; a very 

 faint lateral band on posterior half of body; a black caudal spot, 

 which is rather faint in specimens over 6 inches long. Length 6 to 

 10 inches. 



Spawning time about the middle or last of June. 



39. Algansea lacustris Steindachner. 



Algansea lacustris Steindachner, Einige Fisharten, Mexico, 1895, 

 10, pi. in, figs, i-ib; Lago de Patzcuaro: Jordan & Evermann, 

 Bull. 47, U. S. Nat. Mus., 1900, 3140: Meek, Field Col. Mus. 

 Pub. 65, 1902, 78; Patzcuaro. 



Algansea tarascorum Steindachner, ibid., figs. 2-2c; Lago de Patz- 

 cuaro, Michoacan: Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1898, 2796. 



Basin of the Rio Lerma; very abundant in Lago de Patzcuaro. 

 Head 3^3 to 4; depth 3^ to 4; D. 8; A. 7 or 8; scales 24-85 to 

 100-15. Body rather stout, head moderate; snout rather pointed; 

 mouth oblique, terminal, maxillary scarcely reaching vertical from 

 anterior margin of orbit; snout rather pointed, 3^ m head; eye 

 small, 5 to 6 in head; interorbital area moderately convex, 2^ in 

 head; origin of dorsal fin in advance of ventrals, midway between 

 base of caudal and nostril; longest dorsal ray i^ in head; base of 

 dorsal fin 2^ in head; pectoral i% in head; ventral 2^" in head; 

 caudal fin forked, its length 1^3 in head; gill rakers moderately long 

 and slender, about 22 on first gill arch; lateral line complete, some- 

 what decurved. 



Color light reddish above, lighter with a silvery tinge below. 

 The young have a very faint lateral band which ends in a caudal 

 spot. This spot is very obscure in specimens of 6 inches or over. 

 Length about 8 inches. 



This species is easily distinguished from the others of the genus 

 by its very small scales. Spawning time the last of May or early 

 in June. 



