FISHES OF WEST COAST OF PEEU. 33 



opposite posterior margin of the eye. The fontanelle groove fails 

 to reach the occipital process by a distance equal to vertical diameter 

 of eye, its widest and deepest part where it transverses the granu- 

 lated area on top of head, where for a distance equal to the long 

 diameter of eye it is sharply defined, and as wide and deep as base 

 of slender maxillary barbel ; posteriorly it ends in a point ; anteriorly 

 it is continued as a faint line with indefinite gently rounded edges 

 to in front of the eyes, where it abruptly becomes wider, deeper, and 

 sharply defined for a short distance and ends opposite the posterior 

 nostril. ( Starks. ) 



Dorsal high; caudal deeply forked; anterior anal rays longest; 

 distal margin slightly concave; ventrals small; pectorals rather 

 elongate, tips reaching nearly to vertical from posterior base of 

 dorsal. 



Color in alcohol: Dorsal surface bluish black with a tinge of 

 brown on sides; ventral surface whitish, the region below lateral 

 line dotted with brown ; fins dusky ; barbels bluish black. 



These specimens agree closely with Starks's original description of 

 the type. 



Genus RHAMDIA Bleeker. 



37. RHAMDIA GILLI Starks. 



Rhamdia gilli Starks, Fishes from Ecuador and Peru, Proc. U. S. Nat. 

 Mus., vol. 30, 1906, p. 769, pi. 65, fig. 1 : Rio Eten, Eten, Peru. 



The type and one cotype were taken at Eten, Peru, in the Eio Eten. 



Genus PIMELODELLA Eigenmann and Eigenmann. 



38. PIMELODELLA YUNCENSIS Steindaehner. 



Pimelodella yuncensis Steindachner, Herpet-ichthyol, Ergebnisse einer 

 Reise nach Slidamerika, Denkschr. Akad. Wiss. Wien, vol. 72, 1902, p. 

 47; Pacasmayo, Peru. 



Genus PYGIDIUM Meyen. 



KEY TO PERDVIAX SPECIES. 



a\ Dorsal placed partly over the anal ; caudal truncate or rounded. 

 ?)\ First ray of the pectoral prolonged except in very young. 

 c\ Teeth in broad bands in both javrs. 

 d^. Head 6.5 to 7 in total length ; coarse brown confluent blotches, few 

 above anteriorly ; forming two series posteriorly with pale band 



between poeyanurn, p. 34. 



d^. Head about 5 in length (5.33 to 6.6 in total) ; ground color reddish 



brown with lighter spots and vermiculations rivnlaticm, p. 34. 



c*. Teeth in two series in each jaw (?). 



e\ Head narrowed forward, heart-shaped, scarcely wider than long ; 

 upper maxillary barbels reaching to base of pectoral ; origin of 

 anal below end of dorsal ; a dark lateral band, two series of spots 

 above it; top of head spotted. Head 7; D. 8; A. 6. (Kner and 

 Steindachner.) taenia, p. 35. 



