306 MEMOIRS OF THE CARNEGIE MUSEUM 



Three specimens, 90-125 mm. Tumatumari. (C. M. Cat. No. 1836a; I. IT. 

 Cat. No. 12126.) 



Three specimens, 73-110 mm. Crab Falls. (C. M. Cat. No. 1837a; I. U. 

 Cat. No. 12127.) 



Four specimens, 89-106 mm. Bartica. (C. M. Cat. No. 1838a-6; I. U. Cat. 

 No. 12128.) 



I have examined the types of maculatus in the Berlin Museum. They are in 

 a bad state of preservation, but undoubtedly belong to this species or the next- 

 Inasmuch as they are from the Essequibo basin, they more probably belong to this 

 species. 



Head 4.5-4.6; depth 3-3.6; D. 12; A. 10; scales 5-32 or 34-3.5; eyes 1.3 in 

 snout, 3.5 in head, 1.5 in interorbital. 



Elongate, the width half as great as the depth; a distinct depression in the 

 profile over the eye; snout bluntly conical, projecting beyond the small mouth, 

 which is strictly inferior; three teeth on each side of each jaw. 



Origin of dorsal about equidistant from snout and end of adipose; highest 

 dorsal ray a little more than 4 in the length ; upper caudal lobe considerably longer 

 than the lower, about 3 in the length; anal emarginate, the highest ray scarcely, if 

 at all, reaching beyond the tip of the last, sometimes not reaching it ; anal not reaching 

 caudal; ventrals reaching about half-way to middle of anal, pectorals half-way to 

 last third or fourth of the ventrals. 



A large oval black spot on the middle of the sides below the posterior part of 

 the dorsal, a smaller less intense spot half-way between it and the caudal, and a 

 still smaller one at the base of the caudal; a dark streak upward and forward from 

 the eye, meeting its fellow on the snout; a dark band connecting the eyes; about 

 nine short dark bands across the back; a dark spot on the lower part of the opercle, 

 a smaller one between it and the orbit, in contact with the latter, another on the 

 upper part of the gill-opening; a row of three spots on the sides, in a line continuous 

 with the third dorsal bar in front of the dorsal; a similar row of larger spots con- 

 tinuous with the second bar in front of the dorsal; a spot below the middle of the 

 large median spot, another below the space between the two lateral spots; some- 

 times the lower ends of some of the dorsal bands are separated as spots above the 

 line of the median lateral spots; a spot at base of origin of anal; another above the 

 end of the anal ; caudal peduncle with a median dark spot and other dark shades or 

 spots; posterior part of anal dark. The position and shape of the spots varies in 

 the different individuals. 



