Fisher: Hypophthalmid.e, Diplomystid^, Silurid.e. 409 



lower lobe much shorter than the upper. The anal is longer, having 

 twelve to fifteen rays. In all other respects similar to minuta. 



1 8. Imparfinis minuta Lutken. 



The type-locality of this species is the Rio das Velhas, a southern 

 tributary of the Rio Sao Francisco. The following specimens may 

 therefore be referred to this species without question. 



6294o-(f, C. M., four, 31-67 mm., Rio das Velhas, May 10, 1908. 

 Haseman. 



The maxillary barbel in the largest specimen reaches to near the 

 tip of the ventrals. The eye is contained three and one-half times in 

 the head and is greater than the interorbital. The anal rays counting 

 everything number eleven. With less certainty the following may be 

 referred to this species: 



62960-^, C. M., three, 26-50 mm., Jacarehy, Rio Parahyba, July 15, 



1908. Haseman. 

 6g2$a-d, C. M., four, 29-44 rnm., Mogy das Cruzes, Rio Tiete, July 



19, 1908. Haseman, 



In these the maxillary barbel extends nearly to the ventrals or to 

 their second third. The diameter of the eye is four and one-quarter 

 to five times in the head, equal to, or a little less than, the interorbital. 

 The anal rays are ten or eleven. 



Very similar to these is 



6929a, C. M., one, 81 mm., Iporanga, Ribeira da Iguape, Dec. i, 1908. 

 Haseman. 



The maxillary barbel reaches to the middle of the ventrals. The 

 eye is five times in the head and less than the interorbital. The anal 

 is ten times in the length. The caudal lobes are nearly equal. In all 

 the above-mentioned specimens the origin of the ventrals is under the 

 middle of the dorsal, the pectorals reach the ventrals, the caudal lobes 

 are equal. The eye in the smaller ones is without trace of a free 

 orbital margin; in the larger specimen (No. 2929) there is a trace of 

 a rim. 



69270-/2, C. M., eight, 40-71 mm., Piracicaba, Tiete basin, Sept. 7, 

 1908. Haseman. 

 These specimens are much distorted and are not fair material for 



