304 MEMOIRS OF THE CARNEGIE MUSEUM 



its highest ray about 4.5 in the length; caudal broad, leathery, the upper lobe longer, 

 4 in the length; anal obliquely truncate, the longest rays reaching caudal, ventrals 

 reaching more than half-way to vent, pectorals half-way to middle of ventrals. 



Bases of all the scales of the side and back dark, the extent of the dark area 

 variable; a median dark band along the sides from below the posterior half of 

 the dorsal to the caudal in the young, the band becoming broken into two or three 

 spots with age; the spot under the dorsal most intense, the one on the base of the 

 middle caudal rays small, frequently absent; a spot midway between the two is 

 also absent at times. Young with a dark spot below the second and third scale 

 of the lateral line, and a series of three fainter ones with cross-shades following it. 



In life the bases of the scales below the lateral line and in front of the lateral 

 spot are reddish, the bases of the rest yellowish; pectorals faintly yellow; opercle 

 and a streak to the nares golden. 



I have some evidence that I have obtained from Guiana two species of 

 Leporinus with spots on the sides. I must, however, leave the final determina- 

 tion of this point till the revision of the genus is undertaken. 



Provisionally I may record the following specimen as belonging to the second 

 species. 



One specimen, 64 mm. Tumatumari. (C. M. Cat. No. 2214, Plate XLIII, 

 fig. 4.) 



Compared with a specimen 75 mm. long referred to friderici from the same place 

 we find the following: 



75 mm. 64 mm. 



Depth 3.33. Depth 3. 



Anterior anal ray reaching beyond tip Anterior anal ray reaching tip of last. 



of last. 

 D. 13; A. 10. D. 12; A. 10. 



Head 3.66. Head 3.5. 



Scales 5-37-5. Scales 5-37-5. 



A dark spot below the second and third A spot on the second scale of the lateral 



scales of the lateral line; three line; a larger spot on the thirteenth 



fainter vertical spots below the to sixteenth scales, a third on the 



sixth, eighth, and tenth scales of twenty-fifth to twenty-sixth, a 



the lateral line respectively; an fourth on the last three scales; 



oval spot including the thirteenth no lateral band. 



to seventeenth scales of the lateral 



line, a second one including the 



