162 CALII^ORNIA ACADEMY OF SCIENCES. 



specimen the space between the beginning of the adipose 

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

 while in the smaller specimen it is nearly 2. 



Caudal 3i-3g in the length, deeply forked, the upper 

 lobe much longer than the lower, pointed; lower lobe 

 rounded. Anal Ig 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, Ig-lg in head, the rays a little 

 longer. Depth of caudal peduncle 2-2$ 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 4-J-45; depth 5-6; D. I, 6; A. 11 or 12. 

 119. Pimelodella brasiliensis. 



Pimelodns {Pseudorhamdla) brasiUensis Steindachuer, SB. Ak. 



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



(Kio Parahyba). 

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



Ser. i, 133, 1888 (name). 

 Habitat: Eio 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, Regno Animal, ii, 203, 1817 (species 

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



