SOUTH AMERICAN NEMATOGNATHI. 367 



Body little depressed anteriorly, its depth 1J in its 

 width. Depth of the head little more than half the 

 length of the snout; head without keels or ridges, its 

 surface and all the plates evenly hispid; transverse pro- 

 file of the occiput regularly convex; occipital terminating 

 in a triangular process which is margined by a single 

 nuchal plate; the nuchal plates indistinctly bicarinate. 



Orbit without a notch, 4J in the snout, 7J in the head, 

 2 in the interorbital. 



Anterior profile greatly concave, the snout long and 

 narrow; margin of the head with fine, erectile bristles. 

 Teeth fine, numerous, well developed in both jaws; up- 

 per lip granular, lower lip entire, rounded, thickly pap- 

 illose. Free portion of the barbel not as long as the 

 orbital diameter. 



Breast and lower surface of the head covered with 

 numerous irregular plates; belly with 5 series of plates, 

 the outer ones broadest. The two lateral keels moderate, 

 coalescing into one keel at about the 20th scute, the up- 

 per obsolete in front. Distance of the dorsal fin from 

 tip of snout 3 in the length; anterior dorsal ray high, 

 longer than the head. Caudal emarginate, the outer- 

 most rays greatly produced, about 3 in the length. 



Anal about as high as the ventral fins, which are in- 

 serted slightly in front of the dorsal fin, the outer rays 

 thickened and slightly hispid; pectorals similar, their 

 tips reaching little beyond origin of the veiitrals. 



Brownish, lighter below; rays of the dorsal, caudal, 

 pectoral and sometimes ventrals, spotted with darker. 



Head 4J; D. 8; A. 6; V. I, 5; P. I, 6; Lat. 1. 34. 



Two specimens .19-. 21 in. (to base of caudal). Mana- 

 capuru. W. James. 

 305. Loricaria brevirostris, 



Loricaria brevirostris Eigenin. & Eigenm. Proc. Cal. Acad. 2d Ser. 



ii, 35, 1889 (lea). 

 Type: No. 8,095; one specimen $ , .21m. to base of caudal. lea. 



W. James. 



