374 CALIFORNIA ACADEMY OF SCIENCES. 



keels; interorbital convex; anterior profile concave; tip 

 of snout naked. A narrow orbital notch. Eye Sj in snout, 

 7 in the head, If in the interorbital. 



Lower surface of head naked; teeth numerous and well 

 develoj)ed in both jaws; thoracic plates small, the ante- 

 rior margin of the mailed region truncate, extending to 

 the gill-openings; fine longitudinal series of ventral 

 plates; anal plate and the plates anterior to it as in L. 

 tefeana; nuchal plates obscurely bicarinate; lateral keels 

 becoming more or less entirely coalesced on the fifteenth 

 plate. 



Distance of dorsal fin from tip of snout 3i-3^ in the 

 length ; first dorsal ray higher than length of head; outer- 

 most caudal rays produced; anal fin higher than ventrals 

 or pectorals. 



Light brown with six broad cross-bands, the first on 

 the nape, the second under origin of dorsal fin; a dark 

 band extending forward from eye, a narrower one down- 

 ward; head and anterior portion of body with black pores; 

 dorsal slightly dusky, obscurely spotted, its base with a 

 few spots; base of caudal and a band parallel to its mar- 

 gin dark brown; anal and ventral fins light; pectoral sim- 

 ilar to the dorsal. 



Head 41-5; Lat. 1. 29. 



316. Loricaria anus. 



Lorkaria anus Valencienues, Voy. d"Orb. ix, atlas ii, pi. vi, fig. 1, 



1847; Cuvier & Valencieuues, xv, 470, 1840 (Bnenos Ayres); 



Giinther, Catal. v, 258, 1864 (copied); Heusel, Wiegm. Arch. 



1870, 77 (locality ? ); Eigenm. & Eigeum. Proc. Cal. Acad, ^d 



Ser. ii, 38, 1889 (Kio Grande do Sul). 

 Habitat: Kio Plata aud its tributaries. 



Depth l-J-lf in the width. Surface of the head and 

 scutes of the body slightly hispid. Head long, pointed, 

 its depth 2|-2| in its length; occipital without keels, 

 with a triangular process which is margined by two 

 nuchal plates, its apex touching a third plate; inter- 



