Haseman: New Fishes from the Rio Iguassu. 379 



parted to its base, and the lower lohe is somewhat more extensive. 

 Each specimen is in some details distinct and mij^ht be given specific 

 rank, but I believe that all have been recentK- derived from Rhamdia 

 quclcn, which has arrived by some accident above the Iguassu Falls, 

 where few enemies of fish exist. 



Genus PiMELODUS Lac6p6de. 

 4. Pimelodus ortmanni, sp. nov. (Plate L, fig. 2.) 



The type. No. 2856, measures 16 cm., and comes from Porto Uniao 

 da \ictoria, Rio Iguassu, Dec. 27, 1908. 



I). I. 6; A. 10 or 1 1 ; P. I. 9; eye 2 to 3.5 in snout, 1.5 to 1.8 in inter- 

 orhiuil space and 1.5 in distance between anterior and posterior nares; 

 head 3.5 to 4 in the length; depth 4.33 to 5.5; depth of caudal peduncle 

 3.5 in head; body rather slender and round; lips rather thick and 

 reflexed; barbels all shorter than in P. clarias, maxillary barbels not 

 reaching past anal; postmentals not beyond middle of pectorals 

 and mentals not beyond base of pectorals; humeral process rather 

 slender and pointed; front edge of dorsal and pectoral spines almost 

 smooth and both shorter than the length of the head; no vomerine or 

 pterygoid teeth; upper lobe of caudal longer than the head; head more 

 or less granular and the posterior part almost naked in older specimens; 

 adipose about 5 in length; intermaxillary teeth present; gill-rakers 

 4 to 6—13 to 17 on first arch. 



Back with few to several irregular dusky spots; sides with three to 

 six irregular rows of dark brown blotches in the smaller examples; the 

 number of rows fewer, the spots larger in larger examples. Some 

 have almost no color, while others are mottled because of the mixture 

 of spots. 



The cotype, No. 2857, has a total length of 20 cm.; head granulated, 

 with little or no skin on posterior part; spots large; eye 2.5 in snout; 

 depth 4.33; head 3.5. This shows that the fish gets thicker and larger 

 with age and has fewer spots. The cotype was taken at the same 

 place and date as the type. 



Cotype, No. 2858, 25 cm.; eye 3.5 in snout; depth 4.16; caudal 

 faintly spotted. This variety is locally known as "pintado grosso," 

 and represents about the maximum size of this species, which is the 

 largest fish found in the Iguassu basin above the big falls. Same 

 locality. 



Cot y pes, Nos. 28590-^. Two small examples from the same locality; 



