Fisher: Hypophthalmid.e, Diplomystid.e, Silurid.e. 415 



7221a, C. M., one, 96 mm., Maciel, Rio Guapore, July 26, 1909. 

 Haseman. 



The specimen from Maciel has long barbels, reaching the base of 

 the caudal. In general form and also in color it seems to be identical 

 with the specimens obtained by Dr. Eigenmann in the Rupununi, 

 British Guiana. The specimen has three bands about the width of 

 the eye along the entire length of the sides. These bands toward the 

 head show indications of breaking up into spots. There is an intensely 

 black bar at the base of the dorsal spine and the free margin of the 

 adipose is dusky. 



'J222a-h, C. M., two, 86-138 mm., Berlin, Rio Mamore, Sept. 15, 

 1909. Haseman. 



In general appearance these specimens resemble those from the 

 Rio San Francisco. One is moderately and evenly pigmented while 

 the other is without pigment. 



7223a, C. M., one, 135 mm., San Antonio de Rio Madeira, Nov. 3, 

 1909. Haseman. 



72240-^, C. M., two, 102-124 mm., Villa Bella, Oct. 5, 1909. Hase- 

 man. 



32. Pimelodus altipinnis Steindachner. 



7234a, C. M., one, 140 mm., Belem, Jan. 15, 1910. Haseman. 

 7235a-c, C. M., three, 130-180 mm., ParA, Dec. 2^, 1909. Haseman. 

 7236a-c, C. M., three, 120-135 mm., San Joaquin, Sept. 5, 1909. 



Haseman. 

 7237a-j, C. M., ten, 56-101 mm., Santarem, Dec. 11, 1909. Haseman. 



33. Pimelodus valenciennis Kroyer. 



7238a-w, C. M., thirteen, 61-148 mm., Uruguayana, Feb. 5 to 7, 1909. 



Haseman. 

 7005a, C. M., one, 67 mm., Buenos Aires, Feb. 20, 1909. Haseman. 



This species is a true Pimelodus, the parietal fontanel being absent, 

 the frontal fontanel ending abruptly opposite the posterior edge of the 

 orbit. This arrangement of fontanel is found in the smallest speci- 

 mens of the genus, while Pimelodella always has a parietal fontanel 

 extending to the base of the occipital process, a bridge being present 

 immediately behind the eye. 



