ANNOTATED LIST OF THE SPECIES 
00 
on 
5. BUNOCEPHALUS MELAS Cope 
Bunocephalus melas Cope, 1874, Proc. Acad. Nat. Sei. Phila., XX VI, 132, Nauta; 
Cope, 1878, Proc. Amer. Phil. Soc., XVII, 681, Nauta; 
Eigenmann and Higenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 18, Peruvian Amazon; 
RHigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 380. 
Known only from the Peruvian Amazon. 
15841, 1, 37 mm., Rio Morona, Allen, October, 1920. 
A small number of the specimens listed or described below were collected 
in Brazil by Dr. John Haseman for the Carnegie Museum, where his material was 
in charge of Professor EKigenmann, at the time Curator of Fishes there. _Haseman’s 
types and all but a few duplicates were returned to the Carnegie Museum. 
6. BUNOCEPHALUS RETROPINNIS Eigenmann, sp. nov. 
Plate II, fig. 3 
14332, 2, cotypes, 86 mm., Cacequi, Brazil, Haseman, Feb. 1909. 
Extralimital. 
Distinguished by the backward position of the dorsal, the origin of which is 
sometimes nearer the caudal than the snout. 
Head 5-5.5; depth 5.5-6; D. 5; A. 8, width at origin of pectorals 3 in the 
length; depth of head 6.5-7; distance between snout and pectoral 4—4.25 in the 
length; nuchal plate narrow, terminating in a knob, sloping forward from knob 
to a point between the posterior end of the bases of the pectorals; two lower knobs 
between the larger knob and the dorsal fin; snout truncate, general shape not unlike 
that of a guitar; coracoid processes converging, about equal to the space between 
their bases; interorbital equal to snout and eye; maxillary barbels reaching just 
beyond the base of the last pectoral ray; mental barbels reaching the postmentals 
which reach in turn beyond the gill-opening. Teeth minute, feeble; a large pectoral 
pore; dorsal rays coterminous; caudal rounded, a little longer than the head; anal 
rounded, its basis about 7 in the length; ventrals distinctly behind origin of dorsal, 
reaching to, or nearly to, the anal; pectoral spines not reaching ventral. 
No parts showing great prominence. 
General color gray, sides and back spotted, dorsal dark at base, becoming 
speckled and rusty toward margin; caudal light at basis, shading into marble, the 
extreme margin light; anals hyaline or marbled toward the tips, the pectoral similar 
to the predorsal area. 
15415, 1, 85 mm., Uruguayana, Brazil, Haseman, February, 1909. 
This specimen, probably belonging to retropinnis, had the origin of the dorsal 
shghtly in advance of the middle; the coracoid processes flaring outward toward 
their tips; the ventral just reaching the anal. 
