250 MEMOIRS OF THE CARNEGIE MUSEUM 



6978a-?/ C. M., 37-51 mm., Mogy das Cruzes, Rio Tiete, July 19, 1908. Haseman. 



Allied to P. lateristriga and P. transitoria. 



Head 4.25; depth 5; D. 1.6; A. 11; eye 4.5 in the head; intcrorbital equals 

 eye; maxillary barbel reaching a little beyond base of ventrals; adipose 3.8 in the 

 length; caudal 5; distance from snout to dorsal fulcrum 3 in the length; fins all 

 small; pectoral spine equals snout and eye; 11 hooks on over half of the distal 

 anterior face of the spine; 12 feeble teeth not over one-third as wide as the spine 

 on a little over half of the posterior face of the spine; pectoral fin equals length of 

 head less opercle; ventral fin equals snout and half the eye; base of anal equals 

 length of snout; dorsal spine equals snout and half eye; a well-developed band 

 from snout to caudal. 



27. Pimelodella griffini sp. nov. (Plate XXXII, fig. 3). 



6962 C. M., type, 87 mm.; 6963a-e C. M., paratypes, 55-88 mm., mountain rills 



near Sapucay, Paraguay, April 2, 1909. Haseman. 



Distinguished by the filamentous dorsal ray. 



Head 4-4.5; depth 5-5.5; depth of caudal peduncle one-half of greatest depth; 

 D. 1.6; A. 13 counting everything; eye 1.6 in snout, 4 in head; 8 in interorbital; 

 adipose 3.5-4.5 in the length; maxillary barbel reaching tip of ventrals or shorter; 

 outer mentals but little if any beyond base of pectoral. Dorsal spine about equal 

 to the pectoral spine, prolonged into a filament, spine and filament sometimes equal 

 one-third of the length, the filamentous portion being sometimes longer than the 

 spine. Pectoral spine with 9-11 spinules on the basal two-thirds of the posterior 

 edge; the anterior edge with retrorse hooks near the tip and minute serrations 

 the rest of the way; dorsal spine nearly smooth; upper caudal lobe the longer, 

 the lower as long as the head; a dark band from anterior nares to end of middle 

 caudal rays. 



One specimen has a light band through the dorsal, the dorsal 1.7; the eye 

 less than the interorbital. 



28. Pimelodella mucosa Eigenmann & Ward. (Plate XXXIII, fig. 1). 



Pimelodella lateristriga {non Miiller & Troschel) Eigenmann, part." Ann. Car- 

 negie Mus., IV, 1907, p. 114 (Villa Rica). 



Pimelodella mucosa Eigenmann & Ward, Ann. Carnegie Mus., IV, 1907, p. 114, 

 plate XXXII, fig. 1; Eigenmann, Reports Princeton Univ. Exp. Patagonia, 

 III, 1910, p. 389. 



'' One of the small specimens referred to Pimelodella lateristriga seems to belong to this species; 

 the others certainly do not. 



