244 MEMOIRS OF THE CARNEGIE MUSEUM 
6953a—-b C. M., 55 mm., Cachoeira, Rio Jacuhy, into Lago de Patos, Jan. 26, 1909. 
Haseman. 
6954a-d C. M., 53-60 mm., Porto Alegre, Rio Grande do Sul, Jan. 19, 1909. Hase- 
man. 
4876a—c I. U. M., 97-123 mm., Rio Grande do Sul. Von Ihering. 
Habitat—Basins of the Uruguay and of the Lago de Patos. 
These specimens have longer barbels than the ones from Sapucay and are 
much lighter in color, the dark along the back being interrupted at the dorsal plate 
and the end of the dorsal, the occipital process is also much lighter than the area 
bordering it. Only one of these specimens has the dorsal 1.7, the rest all 1.6. 
A. 42, +8, 42; the maxillary barbel always longer, extending to end of ventral 
or middle anal. Adipose fin 3.75—-4.25. 
16. Pimelodella notomelas sp. nov. (Plate XXX, fig. 3). 
6955 C. M., type, 51 mm.; 6956a-f C. M., paratypes, 37-53 mm., San Luiz de 
Caceres, May 24-27, 1909. Haseman. 
6971a—-d C. M., 35-60 mm., Rio Jauru, June 2-4, 1909. Haseman. 
Habitat—Upper Paraguay Basin. 
Distinguished by the black spot on the dorsal. 
Head 4.2; depth 4.5-5; D. 1.6; A. 12 or 13; eye 3-3.5 in the head, a little 
greater than the interorbital; maxillary barbel extending to tip of middle caudal 
rays or a little shorter, postmental barbel to near tip of pectoral; adipose 3 in the 
length, its origin in advance of the tip of the dorsal; dorsal spine slender with a 
few retrorse hooks near the tip in front, its height not quite equal to snout and 
eye; pectoral spine very little greater than snout and eye, with a very few short, 
feeble teeth behind; caudal very deeply forked, the lobes equal, about 3 in the 
length; a black wedge through middle of dorsal, the black on the first three mem- 
branes forming a conspicuous blotch, otherwise plain. No lateral band. 
17. Pimelodella mete sp. nov. (Plate XXXI, fig. 1). 
13768a I. U. M., 48 mm., Quebrada Cramalote, Villavicencio. Gonzales. 
7441a C. M., type, 77 mm., Rio Negro, Villavicencio. Gonzales. 
7442a-b C. M., 18769a-c I. U. M., 80-100 mm., Barrigona, Rio Meta. Gonzales. 
Habitat—Upper Meta of the Orinoco Basin. 
Head 4.8; depth over 6; eye 4 in the head, intraorbital 4-5; D. 1.6; A. 11 or 
12; depth of caudal peduncle equal to postorbital part of head. Maxillary barbel 
almost or quite reaching origin of anal; outer mental barbel to middle of pectoral 
