PimelodiruB from Canada. 41 



a third greater than the diameter, and the interorbltal space 

 equals a diameter. 



The anterior fontanelle commences before the anterior mar- 

 gins of the orbits, and extends nearly to the posterior margin of 

 the eye • the posterior fontanelle is nearly as long as the ante- 

 rior, and is separated from it by a narrow interval. 



The maxillary barbies extend beyond the anterior third of 

 the pectoral fins, and the external barbies behind the lower jaw 

 nearly reach to the bases of the same fins. 



D. 1-5—0. A. -28. C. 1, 7, 8, I. P. 19. Y. 8. 



The color of the single specimen preserved in spirits is dark 

 olive brown on the head, and rather lighter on the back, while 

 the sides have a silvery lustre ; the abdomen is white. The 

 anal fin and the adipose dorsal are clouded on their borders. 

 The caudal fin is also darker at its margin. 



A single specimen of this species was sent by Dr. Delos "W. 

 Beadle, from St. Catherine's, Canada "West, to Mr. J. C. Brevoort, 

 to whom I am indebted for the privilege of describing it. As 

 it appears to be a young fish, and is, at the same time, in poor 

 condition, I have refrained from giving a full descrij)tion of it ; 

 a more detailed account may be expected in a short time. 



This seems to be the only species of the genus certainly 

 known. 



A species of this tribe has been described by Franklin B. 

 Hough, M.D., under the name of Pimelodus gracilis, which 

 may be a second species of the genus. No description, how- 

 ever, is given of the supra-occipital, and the head is simply 

 described as " slightly flattened, with a longitudinal depression 

 extending from a little below the orbits to a point above the 

 extremities of the gills." The mouth is said to be " small," which 

 can be only applied correctly to a species of the present genus, 

 as the true Pimelodi have the mouth quite large. The P. 

 gracilis is described in a " Catalogue of Reptiles and Fishes 



