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FISHES OF WESTERN SOUTH AMERICA 
7. BUNOCEPHALUS BIFIDUS Eigenmann, sp. nov. 
Pl. II, fig. 2 
Bunocephalus bifidus Eigenmann, in Pearson, 1924, Ind. Univ. Studies, XI, no, 64, 9, Lake Rogagua 
(nom. nud.) 
15412, 5, type and cotypes, 40-47 mm., creek, Yurimaguas, Allen, November, 1920. 
15413, 2, 40 and 44 mm., lagoon, Lago Rogagua, Bolivia, Pearson, November, 1921. 
This Bunocephalus was named and not described in the Pearson veport. 
Clearly differentiated from all other species of Bunocephalus by the bifid post- 
mental barbel. 
Head 5.5; depth about 8; D. 5; A. 7-9; width at base of pectoral 3.66-3.8 
in the length; depth of head 2 in the distance between snout and pectoral; distance 
between snout and dorsal 2.6 in the length; nuchal plate a thin, low crest, entire, 
or with very slightly indented margin; dorsal knob scarcely, if at all, distinct; 
tail slender (Plate II); coracoid processes short, scarcely reaching the middle of 
the short pectoral spine, their length scarcely half the distance between their bases; 
interorbital equals snout and eye; teeth very minute. 
Maxillary barbel reaching to or beyond base of pectoral; mental barbels about 
reaching the postmentals; postmental barbels bifid, one of the rami always shorter; 
pectoral pore large. 
Dorsal rounded or the first ray longest; caudal shghtly rounded, 4 in the length; 
anal basis 5-7 in the length; pectoral spines not near reaching ventrals, not quite 
equal to the head length. 
Ashen, dorsal and posterior part of the caudal black, margined with light and 
with a few light spots; basal portion of caudal lighter; pectorals, ventrals, and anal 
spotted or mottled. Back in front of the dorsal and two or three spots behind the 
dorsal ashen; sides dark with fine vertical light lines. 
The specimens from Rogagua are lighter in color than the rest. The post- 
mental barbels have a scale-like bract at their base, in one of the specimens; the 
left barbel with a short outer branch near its base, the right one a small wart in 
place of it; in the second specimen only the bracts are present besides the barbel. 
The vertical white lines on the sides are largely due to large, white papillae. 
8. BUNOCEPHALUS HAGGINI Eigenmann and Allen, sp. nov. 
Petite 
15408, 1, 94 mm., type, Amazon at Iquitos, Allen, September, 1920. 
15979, 4, 45-115 mm., paratypes, Iquitos, Morris, 1922. 
15409, 2, 68 and 69 mm., Maciel, Brazil, Haseman, 1909. 
15410, 1, 61 mm., Santarem, Brazil, Haseman, 1909. 
Head 4.6; depth at tip of coracoid process 7 or 8; D. 5; A. 7 or 8; width at 
base of pectorals 3-3.3; head depressed, its depth about 2 in the distance between 
the snout and pectoral; distance between snout and dorsal 2.2—2.5 in the length; 
nuchal plate a thin crest with two feeble knobs, a separate knob in front of the dor- 
sal; crests on head all low; snout truncate; tail tapering; coracoid processes very 
