380 CALIFORNIA ACADEMY OF SCIENCES. 



less black, the caudal is dark brown with one or more 

 light cross bars; anal, ventral and pectoral with faint 

 dusky bars. Specimens .16 m. to base of caudal have 

 indistinct spots on the dorsal surface, the spots being 

 most conspicuous on sides of head; dorsal spotted; base 

 and margin of caudal blackish, the central portion of the 

 fin spotted; a dark oblique cross band on the anal fin; a 

 blackish spot on the plate on either side at base of anal 

 fin; ventrals simihir to the anal; pectorals dusky, a darker 

 cross band faintly indicated. 



Head 5-5h D. 8; A. 6; V. I, 5; P. I, 6; Lat. 1. 29. 



Twelve specimens .08-. 17 m. Cudajas; Tonantins; 

 Teffe; Jutahy; Lago Alexo; Tabatinga. 



Two specimens, No. 8079 .06 m. to base of caudal from 

 Jutahy have the lateral keels more or less distinct 

 throughout, the dorsal surface everywhere with light re- 

 ticulations. 



322. Loricaria laeviuscula. 



Loricaria lifviuscula Cuv. & Va,l. xv, 476, 1840 (loc.?); Kner, Pauzer- 

 welse, 81, pi. iii & pi. i, 1853 (Barra do Rio Negro; Eio Brauco; 

 Marabitanos); Gtiuther, v, 256, 1864 (Eiver Capin); Vaillant, 

 Bull. Soc. Philom. series 7, iv, 156, 1880 (Calderon); Eigenm. & 

 Eigenm. Proc. Cal. Acad. 2d Ser, ii, ,37, 1889 (Rio Madeira; Rio 

 Trombetas; Coary; Jntaliy; Porto do Moz; Fonteboa; Gurnija; 

 Manaos; Lake Jose Assu; Silva, Lake Saraca; Xingn; Touautins; 

 Hyavary). 



Habitat: Amazon, Solimoeus, and tributaries from Para to Tabatinga. 



This species is very variable but is readily recognized 

 by the large eye, the narrow interorbital, and the spotted 

 appearance. 



Depressed, the depth 1| in the width; caudal portion 

 of the body with a median dorsal depression; posterior 

 part of the head depressed. Anterior profile rapidly de- 

 scending; depth of the head 2 in its width; occipital end- 

 ing in a triangular process, margined by two nuchal 

 plates. Head without distinct ridges or keels; 2 obscurely 

 bicarinate nuchal plates; head and all the scutes mi- 



