FAMILY V. CYPRINID^;. 45 



Evermann, Bull. 47, U. S. Nat. Mus., 1896, 211: Jordan & 

 Snyder, Bull. U. S. Fish Comm., 1900, 120; Lago de Chalco, 

 Valley of Mexico; Rio Verde, Aguas Calientes: Pellegrin, Bull. 

 Mus. Hist. Nat. Paris, 1901, 205 ; Estado de Jalisco: Meek, Field 

 Col. Mus. Pub. 65, 1902, 77; Aguas Calientes; Lagos; Celaya; 

 Acambaro; San Juan del Rio; Lago de Chalco; Texcoco. 

 Ceratichthys sall&i* Gunther, Cat., vn, 1868, 484; Cuernavaca, 



Mexico. 

 Algansea sallczi Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 



1896, 212. 



Basin of the Rio Lerma, the Valley of Mexico and the head- 

 waters of the Rio San Juan to tributary of the Rio Panuco. (Chalco ; 

 Viga Canal.) 



Head 3^ to 4; depth 3^ to 4; D. 8; A. 8; scales 17-65 to 70-13. 

 Body very stout, moderately compressed; head moderate; snout 

 rather pointed ; mouth terminal, oblique ; teeth 4-4 ; maxillary scarcely 

 reaching vertical from anterior margin of orbit; maxillary 3%" in 

 head; snout 3^ m head; eye small, 6 in head; interorbital area very 

 convex, 2^ in head; origin of dorsal fin in advance of ventrals and 

 midway between tip of snout and base of caudal fin; about 35 scales 

 between nape and dorsal fin; longest dorsal ray i^ in head; base of 

 dorsal 2! in head; pectoral very short, rounded, i^ in head; ventrals 

 2^ in head; caudal fin forked, its length i^ in head; caudal fin of 

 specimens from lakes about the City of Mexico slightly shorter, and 

 the fish slightly more robust than those from the Lerma Basin; gill 

 rakers very short, 15 on gill arch; lateral line somewhat decurved, 

 complete; vertebrae 20+17 =37- 



Color dark reddish brown, gradually becoming lighter below; 

 smaller specimens have a faint lateral band which usually ends in 

 a black caudal spot. This caudal spot is not very evident on speci- 

 mens 6 or more inches in length. Length about 10 inches. 



37. Algansea dugesi Bean. 



Algansea dugesi Bean, Proc. U. S. Nat. Mus., 1892, 283, pi. XLIV, 

 fig. i; Lago de Yuriria, Guanajuato: Jordan & Evermann, 

 Bull. 47, U. S. Nat. Mus., 1896, 212. 



*This is the only record of a species of this genus occurring in the basin of 

 the Rio Balsas. I did not find it south or east of Cuernavaca. I am inclined 

 to believe that the specimen on which the description of Ceratichthys sallcei 

 was based was secured in the markets of the City of Mexico. It is quite prob- 

 able that the pond in the famous Borda Garden was partially stocked with 

 fishes from the lakes near the City of Mexico, and the specimen now in the 

 British Museum was taken from it. This pond is said by Dr. W. L. Tower, who 

 saw it last summer, to be about 400 feet long, 200 feet wide, and the water in it 

 to be 6 to i o feet deep. It contains a large number of fishes from 4 to 8 inches 

 in length. The scales on the type are given by Dr. Boulenger as 57 to 60. 



