Fisher: Hypophthalmid^, Diplomystid.^, Silurid.e. 413 



The specimens from the main part of the Rio San Francisco from 

 Pirapora to Joazeiro resemble very closely specimens from the Rio 

 Magdalena. They are uniform in color, and but faintly spotted. 



Those from the mountain tributary, Rio das Velhas, and the lowland 

 Lagoa Pereira are conspicuously marked with three rows of spots. The 

 spots in the Rio das Velhas specimens are larger (ten to eleven in 

 the middle row) than in the Pereira specimens (eleven to fifteen in the 

 middle row). One of the specimens from the Rio das Velhas has 

 much larger eyes than the others. 



From the Rio Itapicuru. 



7212a, C. M., one, 169 mm., Itapicuru, March 2, 1908. Haseman 



This specimen has short maxillary barbels. They extend to end 

 of dorsal, the caudal fin is leathery, the rays being much branched. 



About eight irregular rows of small spots, there being about twenty- 

 five spots in the middle row. In general appearance it resembles the 

 Rio das Velhas form, with the large spots broken up into much smaller 

 ones. 



From Ribeira da Iguape. 



7225C-&, C. M., two, 185-200 mm., Iporanga, Dec. i, 1908. Haseman. 



The specimens from Iporanga are like the one from the Itapicuru, 

 except that the spots are larger and in only three rows along the sides. 

 From the La Plata basin. 



72130-0, C. M., fifteen, 45-160 mm., Villa Hays, April 11, 13, 1909. 

 Haseman. 



72i4a-&, C. M., two, 161-169 mm., Caceres, May 22-24, 1909. Hase- 

 man. 



72l5a-(f, C. M., four, 51-145 mm., Corumba, April 28, May 9, 1909, 

 Haseman. 



72i6a-c, C. M., three, 1 18-184 mm., Asuncion, March 31, 1909. 

 Haseman. 



72260-0, C. M., fifteen, 48-77 mm., Uruguayana, Feb. 5, 7, 1909. 

 Haseman. 



The specimens (7226) are typical for the variety macrospila as de- 

 scribed by Eigenmaxin & Eigenmann, South American Nematognathi, 

 1890, p. 175. 



7227a, C. M., one, no mm., Itapura, Rio Tiete, Sept. 27, 1908. 

 Haseman. 



