53. PIMELODUS. 121 



11. Pimelodus stegelichii. 



? Heterobranchus sex"-tentaculatus, Agass., in <S)«.r, Pise. Bras. p. 28. 



tab. 11. 

 Pimelodus stegelichii, Mull, ty Trosch. Hor. lehth. iii. p. 3. 



D. 1/6. A. 12. P. 1/9. 



Head covered with thin skin above ; occipital process triangular, 

 much longer than broad, not reaching the basal bone of the dorsal 

 spine. Adipose fin very long, two-fifths of the total length (without 

 caudal) ; it commences and terminates at a very short distance from 

 the dorsal and caudal fins. The maxillary barbels extend to the 

 middle of the adipose fin, and the outer ones of the mandible to or 

 beyond the extremity of the pectorals. 



The height of the body is one-fifth or two-elevenths of the total 

 length (without caudal), the length of the head rather less than one- 

 fourth. Jaws subequal in length ; the band of intermaxillary teeth 

 eight times as broad as long. 'The diameter of the eye is two-fifths 

 of the width of the interorbital space. Dorsal fin as high as long. 

 Pectoral spine serrated along both edges, more than half as long as 

 the head. Porus axillaris minute. The anal fin does not extend 

 to the vertical from the end of the adipose fin if laid backwards. 

 Caudal fin cleft nearly to the base. Dark brown ; dorsal fin with 

 the usual whitish cross-band. 



Surinam. 



a. Adult : stuffed. Demerara. From the Collection of the Zoolo- 

 gical Society. 

 6. Adult. Surinam. Purchased of Mr. Frank. 



12. Pimelodus gracilis. 



Pimelodus gracilis, Va/enc. in d'Orb. Voy. Amer. Merid. Poiss. pi. 2. 

 fig. 5 ; Cuv. Sf Vol. xv. p. 181 ; Kner, Sitzgsber. Acad. Wiss. Wien, 

 xxvi. p. 418. 



D. 1/6. A. 12-13. P. 1/8. 



Head covered with skin above *. The adipose fin is long, one- 

 third of the total length (without caudal) ; it is separated from the 

 dorsal by an interspace which equals the length of the latter. The 

 maxillary barbels extend to the middle or to the end of the adipose 

 fin, the outer ones of the mandible beyond the root of the pectoral. 



The height of the body is rather less than one-sixth of the total 

 length (without caudal), the length of the head two-ninths. Eye 

 rather large, more than one-fifth of the length of the head. The 

 upper jaw is the longer. Dorsal fin much higher than long, its spine 

 being slender, three-fourths of the length of the head. Pectoral 

 spine rather long, strongly serrated. Caudal fin deeply forked, with 

 the upper lobe produced. A blackish band along the lateral line. 



Brazils. 



* In the figure quoted, the occipital process is represented as joining the basal 

 bone of the dorsal spine, whilst Valenciennes and Kncr refer this species to that 

 group of Pimelodus in which those two bones are separate. 



