162 FISHES OF WESTERN SOUTH AMERICA 
Type: Vandellia sanguinea Eigenmann 
The characters of the genus as indicated under the preceding. 
125. URINOPHILUS DIABOLICUS Myers 
Urinophilus diabolicus Myers, 1927, Bull. Mus. Comp. Zool., LXVIIT, 132. 
Upper Amazon 
17701, 1, type, 47 mm., Iquitos, Allen, September, 1920. 
Called carnero by the inhabitants; taken from the belly of a doncella (Pseudo- 
platystoma), where it had penetrated half-way inside through the body wall, and 
not by a natural opening. Much distended with blood; color black, partly with 
the contents, while fresh. 
Much less elongate than U. sanguineus and U. erythrurus; somewhat faded in 
alcohol to a brownish color, with finer, dark brown chromatophores on the back. 
126. URINOPHILUS ERYTHRURUS Eigenmann 
Urinophilus erythrurus Eigenmann, 1922, Bijdr. Tot de Dierk. Amst., X XII, 114, pl. iv, figs. 10-16; 
Pearson, 1924, Ind. Univ. Studies, XI, no. 64, 17. 
Eastern Peru and northern Bolivia 
15584, 10, 120-145 mm., type and paratypes, Rio Morona, Allen, October, 1920. 
15604, , Rio Morona, Allen, October, 1920. 
15715, 3, 64-74 mm., Rio Paranapura, Yurimaguas, Allen, November, 1920. 
15713, 3, 49-53 mm., Gosulimacocha, Rio Morona, Allen, October, 1920. 
15714, 3, 45-51 mm., Rio Morona, Allen, October, 1920. 
15717, 1, 127 mm., Rio Ucayali near Orellana, Allen, August, 1920. 
17104, 1, 75 mm., Rurrenabaque, Bolivia, Pearson, November, 1921. 
It is of interest and possibly significant that both Pearson’s specimen and 
those from Peru were all collected along the fringe of the piedmont, in the edge of 
the flood plains. 
Body compressed; head depressed, flat below, arched above; depth of head 
equals distance between pupillary centers; eye about 5 in head; interorbital distance 
equal to snout; 5-9 teeth forming a crescentic row below the snout; a series of 
about four claw-like teeth on the mawxillaries, concealed in a fleshy pocket; very 
few recurved teeth at the ends of the mandible, whose extremities are widely 
separated; outer barbel extending to the end of the interopercular spines; the 
latter numerous (about ten), their tips curved; opercular spines more numerous 
(about twenty-five), also curved at the tip; pectorals about equal to the head less 
half the snout; distance between the origin of the ventrals and base of caudal 
equal to about one-third the length; origin of dorsal forward of the vertical from 
the origin of the anal; depth of caudal peduncle 3 or more in its length; caudal 
emarginate. 
Plumbeous above; white below, middle of caudal dark, the outer parts pink 
in life. 
The maxillary is a two-part bone; the inner (mesial) division articulates in a 
