162 CALIFORNIA ACADEMY OF SCIENCES. 



specimen the space between the beginning of the adipose 

 fin and end of first dorsal is 1 J in the base of the adipose, 

 while in the smaller specimen it is nearly 2. 



Caudal 3J-3J; in the length, deeply forked, the upper 

 lobe much longer than the lower, pointed; lower lobe 

 rounded. Anal 1| in head. 



Ventrals inserted immediately behind the vertical 

 from last dorsal ray, their tips reaching the beginning 

 of the adipose, one-fourth their length from the origin 

 of the anal fin. 



Pectoral spine flat, 1J 1* in head, the rays a little 

 longer. Depth of caudal peduncle 2-2J in head. 



Color brown above, sides lighter, ventral surface white; 

 a well defined dark brown band from tip of snout to 

 caudal, continued on middle caudal rays, widest on 

 shoulder; the dorsal fin with a narrow dark bar on the 

 membrane close in front of each ray and parallel with 

 it; adipose dorsal very narrowly margined with dark; 

 caudal dusky; pectorals, ventrals and anal with very 

 minute punctulations on the margins of the rays. 



Head 4J-4i; depth 5-6; D. I, 6; A. 11 or 12. 

 119. Pimelodella brasiliensis, 



Pimelodus (Pseudorhamdia) brasiliensis Steindachner, SB. Ak. 



Wien, Ixxiv, 1876, Siisswasserfische stidostl. Bras, iii, 50, pi. vii 



(Rio Parahyba). 

 Pimelodella brasiliensis Eigeum. & Eigenm. Proc. Cal. Acad. 2d 



Ser. i, 133, 1888 (name). 

 Habitat: Rio Parahyba. 



This species, if the characters assigned to it will prove 

 constant, is the most aberrant of the genus. It is known 

 from a single specimen. 



XXI. PIMELODUS. 



Pimelodus Lacepede, Hist. Nat. Poiss. v, 1803 (species 

 of several genera). 



Pimelodus Cuvier, Regne Animal, ii, 203, 1817 (species 

 having a single band of teeth in the upper jaw). 



