SOUTH AMERICAN NEMATOGNATHI. 147 



ranted in believing it to agree with those genera in the 

 air-bladder, fontanel and occipital process. 



107, Nannoglanis fasciatus, 



Nannoglanis fasciatus Boulenger, 1. c. 278, pi. xxi, fig. 3 (Ecuador) 

 Habitat: Ecuador. 



Eye 3 in snout, 1J in interocular. Maxillary barbels 

 extending to the middle of the pectoral. Origin of dor- 

 sal fin midway between tip of snout and end of adipose 

 which is as long as the head. Pectorals not reaching 

 ventrals. Vent below origin of dorsal. Yellowish, with 

 four broad, brown, black edged cross bands above; a 

 dark brown line from eye to maxillary barbel. Head 

 5; depth 9; D. 7; A. 8. (Boulenger.) 



XX. PlMELODELLA. 



Pseudorhamdia Steiiidachner, SB. Ak. Wien, Ixxiv, 

 1876, Siisswasserf. siidostl. Bras, iii, 46 (lateristriga) , 

 not Pseudorhamdia Bleeker. 



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

 Ser. i, 131, 1888 (cristatus). 



Type: Pimelodus cristatus Miiller & Troschel. 



The name Pseudorhamdia is not available for this 

 genus as the original type of it was maculatus. It is a 

 synonym of Pimelodus. The characters of this genus are 

 given in the key. 



ANALYSIS OF THE SPECIES OF PIMELODELLA. 



a. Adipose fin 2-J-2| in the length. 



b. No dark lateral band. Lower caudal lobe much broader than the 

 upper, the lobes sometimes longer than the head, sometimes much 

 shorter. Dorsal spine with fine teeth behind and several large notches 

 near the tip in front. Pectoral spine rather stout, with fine, recurved 

 teeth on its posterior margin J-i of the width of the spine, anterior 

 margin roughened, with recurved hooks near the tip. Maxillary 

 barbels not extending beyond tip of adipose except in young. 



cristatus 108. 



bb. A dark lateral band; upper caudal lobe sometimes produced in a 

 filament. 



