78 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



Algansea dugesi Bean is perhaps a valid species. It differs 

 from A. tincella in having more gill-rakers. None of the specimens 

 in our collection can be referred to this species. Dr. Bean gives 

 the number of gill-rakers as 44-15. The dorsal fin is inserted 

 slightly before the ventrals in A. dugesi and over them in A. tin- 

 cella. 



Ovaries well developed; spawning time about middle of May 

 to early in June. 



The natives on Lago de Chalco bake this fish in corn husks to 

 sell at the trains and in the markets. 



This species seldom exceeds 8 inches in length. Aguas Cal- 

 ientes; Lagos; Celaya; Acambaro; San Juan del Rio: Chalco: 

 Texcoco. 



Algansea rubescens, sp. nov. 



Type. No.' 3653, F. C. M. Length. 6 inches. 



Locality, Rio Santiago. Ocotlan, Jalisco, Mexico. 



Head 4: depth 4: D. 8; A. 7: scales 16-65-10. Body elongate, 

 rather robust: snout bluntish, 4^ in head; mouth oblique, lower 

 jaw shorter, included; maxillary scarcely reaching eye, 3^ in head: 

 caudal peduncle large, its least depth 2 in head: 33 scales before 

 the dorsal, the origin of the latter slightly nearer the base of 

 caudal than tip of snout; lateral line complete, decurved. Color 

 olivaceous with a reddish tinge on sides, silvery below, a black 

 spot at base of caudal fin. No markings on other fins. 



Ovary well developed, spawning time probably about the 

 middle or last of June. Longest specimen, 6 inches. 



This species differs from A. tincella in the larger and more 

 numerous gill-rakers. It differs from A. lacustris in having much 

 larger scales. Ocotlan. 



Algansea lacustris Steindachner. 



This species is characterized by its small scales, there being 

 from 85 to 94 in the lateral series, and from 30 to 36 in transverse 

 series. The gill-rakers are long and slender, the number being 

 5-J-I7. This species is much lighter in color than the others of 

 the genus. Dr. Steindachner describes a second species of this 

 genus from Lago de Patzcuaro. A. {arascorum, which differs from 

 A. lacustris in having much larger scales, about 76 in the lateral 

 line. An examination of the figures of these two species shows 

 each to have about go scales in the lateral line. 



I examined a large number of Algansea taken by the fishermen 



