eigenmann: pimelodella and typhlobagrus 251 



Habitat. — Paraguay Basin. 

 10125 I. U. M., tjq^e, 126 mm., Bahia Negra, Paraguay, Aiiisits. 

 10200 I. U. M., part, 50 mm., Villa Rica, Aiiisits. 



6959a C. M., 135 mm., Puerto Suarcz, Paraguay, May 7, 1909. Haseman. 

 6960a-/ C. M., 63-86 mm., Laguna Ypacary, Arequa, Paraguay, April 7, 1909. 



Haseman. 

 6972a C. M., 112 mm., near Berlin, Bolivia, Rio Mamor^, Sept. 14, 1909. Hase- 

 man. 



Very similar to P. gracilis but the adipose distinctly shorter, the tip of the 

 anal extending to or beyond the tip of the adipose. 



Head 4; depth 5; D. 1.6; A. 10-12; eye 3.5-4.5 in the head; interorbital 3.75-4; 

 maxillary barbel to within an orbital diameter of the caudal or middle of caudal; 

 adipose 3-3.66 in the length. Pectoral spine equal to length of head less opercle, 

 with 5-9 recurved hooks near tip in front, these followed by about 30-40 tubercles, 

 most of which are antrorse; 11-21 recurved teeth along most of the posterior 

 margin; dorsal spine equal to snout and half of the eye. Caudal deeply forked, 

 the lower lobe broader and longer, 3.5 in the length; the tip of the anal extends 

 to or beyond the vertical from the tip of the adipose. A well-developed lateral 

 band, heaviest behind the gill-opening. The maxillary barbel extends to near the 

 base of the caudal and may extend beyond its tip. Eye 4 + in the head; inter- 

 orbital equal to the eye. The adipose is 3-3.66 in the length. 



Key to the Trans-Andean Species of Pimelodella." 

 a. Upper caudal lobe about equal to head in length; pectoral spine with thorns for more than two- 

 thirds its length. 



6. Basal four-fifths of pectoral spine with very strong hooks on its posterior face, the hooks of the 

 distal half longer than the width of the spine at its base. Dorsal spine with a few teeth on 

 its posterior face. Adipose fin 4.25-5 in the length, pectoral spine very little longer than 

 snout and eye, maxillary barbel reaching to somewhere about the ventrals. Head 4.25; 



depth 5; D. 1.6; A. 11-12 29. grisea Regan. 



66. Basal three-fourths or four-fifths of the pectoral spine with hooks along its posterior face, the 

 hooks less than the width of the spine, posterior face of dorsal spine rough; adipose fin 34-3i 

 in the length, pectoral spine about equal to snout and eye. Maxillary barbels reaching some- 

 where about middle of adipose, shorter in the young. Head 4.8, depth 5.5; D. 1.6; A. 12; 



a sharply defined lateral band ,30. modesta (Giinther). 



666. Basal two-thirds of the pectoral spine with eight (6-8 fide Steind.) hooks; posterior face of 

 dorsal spine smooth; adipose fin 2.66 in the length; pectoral spine very little less than snout 

 and eye; maxillary barbel reaching the last third of the ventrals; head 4.33; depth 5; D. 1.6; 

 A. 12; no sharply defined lateral band 31. yuncensis Steindachner. 



" This account is extracted from the MS. of my forthcoming monograph on the fishes of Colombia. 

 It was prepared in collaboration with Mr. Homer G. Fisher. 



