376 Annals of the Carnegie Museum, 



margins, 7 in length of head, a little over 3 in snout; snout 2.33 in head, 

 slightly greater than interorbita! space; barbels all flattened towards 

 the tip, with somewhat membranous margins on one edge; maxillary 

 barbels not extending to end of pectorals; mental barbels all extending 

 a little beyond the base of the pectorals; humeral process pointed and 

 very minute; jaws rather weak and subequal; teeth in bands in each 

 jaw, no vomerine teeth; snout rounded and little or not flattened; 

 lateral line not entire, being composed of several white thick patches 

 along median lateral portion of body, in some cases extending to 

 base of caudal; color almost uniform dark brown with some mottling 

 as in R. quelen; lower sides yellowish white; caudal, adipose, and basal 

 halves of dorsal and anal colored uniformly dark brown like body; 

 pectorals and ventrals colorless; head covered with many round white 

 pores almost as large as nares; posterior nares less than distance of 

 orbital diameter from the eye, anterior nares near the edge of the snout; 

 occipital process not united with the dorsal plate; head in part almost 

 naked and granular. 



I take great pleasure in dedicating this species to Senhor Carlos 

 Moreira, Secretary of the Geological Survey of Brazil, who devoted 

 much time in assisting me during my stay in Brazil. 



Genus Heptapterus Bleeker. 



2. Heptapterus stewarti, sp. nov. (Plate LXXIV.) 



Type and only specimen, No. 2850, from Serrinha Parana, in a 



creek about one-half mile from the Rio Iguassu, Dec. 23, 1908. Rare 



and not known to natives. 



D. 9; A. 30; P. I. 8; V. 6; C. 25+4 accessory rays on both sides, in 



folds of skin which connect the adipose and anal with caudal: 



.Mm. 



Length of body to base of caudal 56 



Length of head 13 



Greatest breadth of head at base of pectorals, which is greatest body 



breadth 10 



Greatest depth of head 7 



Diameter of eye 1.5 



Length of snout 5 



Interorbital space 4.2 



Origin of dorsal from tip of snout 21 



Origin of ventrals from tip of snout 23 



Origin of anal from tip of snout 31 



Origin of adipose from tip of snout 31 



