160 CALIFORNIA ACADEMY OF SCIENCES. 



width of the intermaxillary band 83 in the length of the 

 head. 



Eye 1| in the snout, 4 in the head, about equal to the 

 interorbital space, 1 diameter behind the rictus. 



Maxillary barbels extending to the adipose fin, mental 

 not to base of pectoral fin, postmental to middle of pec- 

 toral. 



Gill-opening not extending forward beyond anterior 

 margin of eye. Humeral process reaching about to 

 middle of pectoral spine. 



Dorsal spine nearer end of snout than to the anal fin, 

 slightly rough on posterior margin, recurved notches 

 near the tip in front, its height Ig-li in the head; high- 

 est dorsal ray about equal to length of head. Adipose fin 

 3^ in the length, its distance from the dorsal fin g the 

 length of its base. 



Caudal deeply forked, the upper lobe longer, 3-| in the 

 length. Anal rounded, I5 in the head. Ventrals in- 

 serted behind the vertical from last dorsal ray, reaching 

 about f the distance toward the anal fin. 



Pectoral spine terete, curved, 1-li in the head, the 

 rays somewhat longer reaching to below anterior half of 

 the dorsal fin. 



Depth of caudal peduncle about 3 in the head. 



Brownish, a dark band along middle of sides extend- 

 ing forward to the snout, sometimes not evident on the 

 head in alcoholic specimens; tips of the fins dusky; 

 basal portion of the dorsal membrane thickened, the re- 

 mainder hyaline. 



Head U; depth 6-7; D. I, 6; A. 12. 



118. Pimelodella chagresi. 



Pimelodus [P ^eudorhamdia) chagresi Steind. SB. Ak. Wien, Ixxiv, 

 1876, Ichthyol. Beitr. iv, 34 (Rio Chagres and its tributary 

 near Obispo). 



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

 i, 1.34, 1888 (Obispo Eiver). 



Habitat: Eio Chagres aud its tributaries. 



