46 Field Columbian Museum — Zoology, Vol. V. 



Basin of the Rio Lerma. 



Fig. 8. Algansea dugesi Bean. 



No. 41818, U. S. National Museum. 



Head 4; depth 4; D. 7 ; A. 6; scales 18-69 to 1 2 ~^Z- Body robust; 

 snout rather pointed, its length $ l / 2 in head; mouth rather large, 

 maxillary reaching to vertical from anterior margin of orbit; lower 

 jaw slightly included; teeth 4-4; dorsal fin inserted somewhat before 

 ventrals; midway between tip of snout and base of caudal; longest 

 dorsal ray 1^ in head; about 30 scales in a series between nape and 

 dorsal fin; length of pectoral fin i}4 in head; ventral if; lateral 

 line decurved, complete; gill rakers 4+15 on first gill arch. 



Color dusky brown; sides of head silvery; a faint dusky spot at 

 base of caudal; upper fins dusky, unmarked. (Bean.) Length about 

 6 inches. Known only from the type locality. 



38. Algansea rubescens Meek. 



Algansea rubescens Meek, Field Col. Mus. Pub. 65, 1902, 78; 



Ocotlan. 

 Lago de Chapala and neighboring region. 



Fig. 9. Algansea rubescens Meek. 



No. 3653, Field Columbian Museum. 



