EIGENMANN: the freshwater fishes of BRITISH GUIANA ' 151 



in height, the second extending past the tip of the last; space between the dorsals 

 6.5 in the length, base of adipose 4.25; caudal lobes slender, longer than head, the 

 middle rays about one-third the length of the lobes; anal emarginate, the anterior 

 rays extending past the tip of the last; ventrals not reaching anal; pectoral to 

 ventrals. 



Straw-color in alcohol; a pair of hidden spots at the base of the caudal, lower 

 lobe dusky. 



In the specimen 65 mm. long the first pectoral ray is enormously prolonged, 

 reaching past origin of the anal; first dorsal ray to the adipose; in the younger 

 specimens they are shorter. In the young there is a faint lateral streak, an area along 

 the base of the anal and along the middle of the back, four streaks on the snout, 

 one from mouth up to base of maxillary barbel and then back to eye, and a pair 

 along the middle of the snout, diverging in front and behind. 



Pseudopimelodus Bleeker. 



Pseudopimelodus Bleeker, Ichth. Arch. Ind. Prodr., I, 1858, 196, 207 (sp.); Nederl. 



Tijdschr. Dierk., I, 1863, 101 (raninus). 

 Batrachoglanis Gill, Ann. Lye. Nat. Hist. N. Y., VI., 1858, 389. 



Type, Pimelodus raninus Cuvier and Valenciennes. 



Distinguished from Microglanis by the backward projecting angles in the 

 premaxillary patches of teeth. 



In 1890 I identified Pimelodus bufonius with the Pimelodus zungaro of Hum- 

 boldt. Humboldt's species is known only from his figure and description, which 

 are said to have been taken from a fish three feet four inches long and reported 

 to attain seven feet. It is very doubtful whether the zungaro of Eigenmann and 

 Eigenmann from Goyaz is identical with Humboldt's species. It is also very 

 doubtful whether Pimelodus mangurus Valenciennes from the La Plata is syn- 

 onymous with zungaro. This elimination of synonyms leaves the genus Pseudo- 

 pimelodus, as here understood, consisting of raninus Cuvier and Valenciennes 

 (the type), bufonius Cuvier and Valenciennes, aeanthochcira Eigenmann and 

 Eigenmann, cottoides Boulenger, and the two species here described. 



Key to the Species of Pseudopimelodus. 



a. Occipital crest not meeting the dorsal plate; dorsal, caudal and ventrals in adult spotted, the latter 

 two not margined with white; dorsal with a median or submedian light bar on the last rays, its 

 margin sometimes white; no humeral spine, pectoral teeth not as wide as the spine .. .villosus. 

 aa. Occipital crest meeting the dorsal plate; a humeral spine. 



h. Teeth on anterior margin of the pectoral spine as wide as the spine or wider. 



