304 MEMOIRS OF THE CARNEGIE MUSEUM. 



Head 8.77; depth 6; D. 9; A. 7; P. 9; teeth pointed, in several irregular scries; 

 head a little longer than broad; eye in middle of head; nasal barbels reaching about 

 to lateral end of head, maxillary barbels a little beyond origin of pectoral. First 

 pectoral ray moderately elongate; caudal truncate; origin of anal behind the vertical 

 from the middle of the dorsa,!, half a head nearer to base of middle caudal rays than 

 to the lateral margin of the head; snout rounded. Body velvety with minute 

 tubercles. Upper part of head, back, and sides light chocolate with darker spots in 

 tolerably regular rows; a dark lateral band, the spots above it larger than the others, 

 those of the uppermost rows sometimes confluent. Fins unspotted. 



21. Pygidium oroyae Eigenmann & Eigenraann. 



Pygidium oroyw Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. (2), II, 1889, 

 p. 51; Occasional Papers Cal. Acad. 8ci., I, 1890, p. 334 (Pochachara, Oroyo 

 River); Proc. U. S. Nat. Mus., XIV, 1891, p. 36; Eigenmann, Reports Prince- 

 ton Univ. Exped. Patagonia, III, 1910, p. 399; Evermann & Radcliffe, 

 Bull. 95, U. S. Nat. Mus., 1917, p. 35, pi. IV, fig. 2 (Oroyo). 

 Habitat. — Rios Oroyo and Perene, central Peru. 



5792, C. M., eighteen, 24-90 mm. Spring sui)i)lying water to Tarma, Peru. 

 Lola Vance. 



Fig. 10. Pijyidlaiii oroyiu Kigeiunaun et Eigeunuiiiii. After Evermann & Radcliffe. 



Head 5.75-6; depth 5.75-8; D. 12; A. 10-11; P. 10. Head about as long as 

 wide; none of the barbels reaching the gill-opening; teeth all pointed; gill-membrane 

 narrowly joined to the isthmus, with a narrow, free margin. Pectoral shorter than 

 head, fan-shaped, the first ray not prolonged. Dorsal inserted over or slightly 

 behind the vent, its last ray over or behind the middle of the anal, its origin equi- 

 distant from anterior margin of eye or occiput and tip of caudal, its distance from 

 the base of the caudal 1.5 in its distance from the snout. Caudal broadly rounded, 

 its distance from the anal 4-4.75 in the length. Ventrals extending to or beyond 

 the anus, their origin about midway between tip of snout and tip of caudal or nearer 

 the former. Chocolate brown; sides, back and unpaired fins with irregular groups 

 of dark points; traces of a dar"k lateral line in the young. 



