Haseman: New Fishes from thi; Rio Iguassu. 377 



Base k'ligtli of adipose 24 



Base length of anal 18 



Teeth in bands in each jaw; no vomerine or palatine teeth; base of 

 dorsal equal to its height and greater than the distance between it and 

 the adipose. • X'entrals and pectorals small and of equal size, a little 

 more than half the length of head; no rays of any fins prolonged; anal 

 and adipose long and of about same height and extent; pectorals with 

 a short rudimentary spine, less than half the length of its longest rays, 

 without teeth or hooks on either side; no external signs of either a 

 dorsal spine or plate; no occipital process; eye small, without face 

 margin; head covered with skin; barbels terete; fontanel not extending 

 far back of eyes; caudal rounded; body and head slightly depressed 

 to origin of dorsal, posterior portion greatly depressed but not tapering; 

 barbels small, maxillary barbels scarcely reaching past the base of 

 pectoral, mental barbels not reaching the same; snout round; jaws 

 almost equal ; lips small ; numerous pores on head ; nares all equidistant, 

 set in angles of a square, and the distance between them greater 

 than the distance between the eyes and the posterior nares. 



Uniform light brown in color without any distinct marking, the 

 basal third of dorsal fin dark. 



I have dedicated this species to Mr. Douglas Stewart, who in various 

 ways assisted me during and after the Expedition to Brazil. 



After comparing this specimen with others representing the dilTerent 

 genera of PimelodincB without free orbital margins, I consider it a 

 Heptapterus, even though it has a rudimentary pectoral spine. 



Genus Rhamdia Bleeker. 

 3. Rhamdia branneri, sp. nov. (Plate LXXV.) 

 No. 2851, type, 10.3 cm. 1 From a creek of the Rio Iguassu, near Ser- 

 No. 2852, co/v/>e, 10 cm. J rinha Parana, Brazil, December 24, 1908. 

 D. I. 6; A. 10; V. 6; P. I. 8; head 3.75; depth 5.25; eye 2.5 in the 

 snout, 2 in interorbital space and 6 in the head; origin of dorsal 2.75 

 in length to base of caudal; dorsal inserted in front of ventrals; dorsal 

 spine weak, small, without teeth and less than one-half as long as the 

 longest rays of the same; pectoral spine long and slender, with teeth 

 on both edges and 2.5 times in the length of head; caudal not lobed to 

 its base and lower lobe the larger; none of fins with produced rays; 

 few pores on head; occipital process pointed, not reaching the dorsal 

 plate; fontanel more or less oval in shape, not extending back of eyes; 



