Field Columbian Museum — Zoology, Vol. V. 



Lampetra spadicea Bean. 



Lampetra spadicea Bean, Proc. U. S. Nat. Mus., 1887, 374; Guana- 

 juato: Bean, Proc. U. S. Nat. Mus., 1892, 283; Tanganzicuaro : 

 Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 13. 



Fig. 1. Lampetra spadicea Bean. 

 No. 38005, U. S. National Museum. 



Basin of the Rio Lerma. 



Infraoral lamina with 9 cusps, the outer largest; lingual teeth 

 with about 20 pectinae; 4 teeth on each side of buccal disk, one or 

 more being tricuspid, the others bicuspid; dorsal fins separate, the 

 interspace equaling half length of snout; second dorsal a little 

 higher than the first, its origin near middle of body. 



Color chestnut brown, somewhat lighter on the belly; basal por- 

 tion of second dorsal pale; the remaining portion somewhat like the 

 body. Length about 8 inches. 



This species is probably distributed throughout the Lerma Basin. 

 Dr. Duges has collected several specimens in the upper waters of the 

 Lerma near Guanajuato. It has also been taken by E. W. Nelson 

 in Lago de Chapala. 



