332 MEMOIRS OF THE CARNEGIE MUSEUM. 



teeth conical, in very narrow bands; nasal barbels reaching to the base, maxillary 

 barbels to the tips of the opercular spines; first pectoral ray not prolonged, pectoral 

 equal to the length of the head without the snout; origin of ventrals equidistant 



Fig. 16. Pygidium pi-oops (Ribiero). No. 7593 CM. 



from tip of snout and tip of caudal; origin of anal under second or third dorsal ray; 

 distance between last ray of anal and base of caudal five and one-third times in 

 the length; caudal rounded; distance between origin of dorsal and caudal two and 

 one-half times in its distance from the snout. 



Back, sides, dorsal and caudal densely spotted. 



The above description is based on the specimen from Agua Quente and Ribeiro's 

 account ; the smaller specimen from the Parahyba has : 



Head 5; depth 8; D. 10; A. 9; P. 5; first pectoral ray considerably prolonged; 

 origin of ventrals equidistant from tip of caudal and pre-opercle. Sides and back 

 finely marbled, a faint dusky, lateral line, and another above it. Its prolonged 

 first pectoral ray and narrow pectoral, with but five rays indicate a distinct variety, 

 which may be called parahybos, var. nov. 



53. Pygidium paolence Eigenmann. (Plate LI, fig. 3.) 2S 

 Pygidium paolence Eigenmann, Proc. Am. Philos. Soc, LVI, Jan., 1918, p. 698. 



Very close to Trichomycterus proops Ribeiro. 

 7081, C. M., type, 68 mm. Alto da Serra, Rio Tiete, Sao Paulo. July 25, 1909. 



Haseman. 

 7597, C. M., paratype, 61 mm. Rio Paranahyba bridge. Aug. 15, 1908. Hase- 

 man. 



Head 5.33-6; D. 8.5; A. 6.5-8 not counting hidden rudiments, D. 10.5 and 

 A. 8.5 with the rudiments; P. 6 or 7; head nearly as wide as long; eye in anterior 

 half of the head, greater than its distance from the posterior nares; snout 2.33-2.5 

 in the length of the head, interocular 3-3.5; teeth conic; nasal barbel reaching base 

 or tip of opercular spines, maxillary barbel reaching tip of opercular spines or a 

 little farther; outer pectoral ray with its filament equal to head behind the posterior 



28 The head is too short in this drawing. 



