Family III. Silurid.k. 15 



10. Amiurus dugesi Bean. Bagre. 



Amiurus dugesi Bean, Proc. U. S. Nat. Mus., 1879, 304; Rio 

 Turbio, Guanajuato: Woolman, Bull. U. S. Fish Comm., 

 1894, 61; Rio Lerma, Salamanca, Guanajuato: Jordan & 

 Evermann, Bull. 47, U. S. Nat. Mus., 1896, 138: Jordan & 

 Snyder, Bull. U. S. Fish Comm., 1900, 117; Lago de Chapala 

 & Guadalajara market: Meek, Field Col. Mus. Pub. 65, 1902, 

 73; Ocotlan; La Barca; La Palma. 

 Amitirus caius Pellegrin, Bull. Mus. Hist. Nat. Paris, 1901, 204; 



Estado de Jalisco. 

 Rio Lerma, and in Lago de Chapala, but does not occur in the 

 lakes about the City of Mexico, nor in Lago de Patzcuaro. 



Head 3$; depth 5; D. 1, 6; A. 20. Body rather elongate; head 

 moderate, flattish above; interorbital 2^2 ; eye 5^; upper jaw slightly 

 the longer; maxillary barbels reaching slightly beyond base of pec- 

 toral; pectoral spine strong, its length 1% in head, weakly serrate 

 behind; base of anal 4^8 in body, shorter than the head; caudal fin 

 deeply forked, its inner rays less than half length of outer rays. 



Color light steel blue above, lighter below; margin of vertical fins 

 black; body without black spots. Length 2 to 3 feet. 



As a food fish, this is one of the most important in the region where 

 found. 



11. Amiurus mexicanus sp. nov. Bagre. 



Type, No. 4507, F. C. M., 11^ inches in length; Rascon, San 

 Luis Potosi. 



Basin of the Rio Panuco. (Rio Verde; Rascon.) 



Head 3:-;; depth 5*^; D. 1, 6; A. 20 or 21. Body elongate, com- 

 pressed behind; head flat, considerably depressed; interorbital 2)4, 

 in head; upper jaw somewhat the longer; mouth wide, its width \\ 

 in head; eye 6 in head; snout 3; dorsal spine moderate, its length 2]/ 2 

 in head; pectoral spine nearly smooth on hinder margin (slightly 

 serrate in young specimens), its length 2)\ in head; base of anal 

 considerably shorter than head, \]A, in body; caudal fin forked, but 

 much less so than in Amiurus lupus; maxillary barbels reaching 

 slightly beyond base of pectorals; outer mandibular barbel not reach- 

 ing to gill opening. 



Color dark steel blue, lighter below; sides of body without black 

 spots; skin very rough, with fleshy hair-like projections. Length 

 12 to 18 inches. 



I secured one large and one small specimen of this species at 

 Rascon, and Dr. Tower collected three specimens at Rio Verde. It 

 is probably one of the smaller catfishes of Mexico. 



