— 423 — 



õ.O ; mandibular ramus 2.5 in interorbital; barbel 

 1.8 in eye. Base of dorsal equal its distance from 

 tip of adipose spine ; pectorals extending- past base 

 of ventral ; dorsal with 8 ra^^s. Supraoccipital bor- 

 dered posteriorly by a singles tcute ; scutes without 

 keels ( except for weak indications of same in the 

 upper row ) ; 28 in longitudinal series ; orbital rims 

 and supraoccipital somewhat raised. Abdomen naked 

 except for minute granular scales in its center and 

 between the pectorals ; snout convex and somewhat 

 pointed. Dorsal with white spots arranged more 

 or less in bands. 



Plecostoimis brevis, new specie^. 



Type collected in the State of São Paulo ; N.° 

 7150; American Museum of Natural History. Length 

 to base of caudal 74 ram. ; head contained 2.6 times 

 in this measure; depth 4.5; snout 1.9 in head; eye 

 6 2; interorbital 2 5; breadth of head 1.2; itsodepth 

 1.6; first dorsal ray 1.0; pectoral spine 1.0 ; ventral 

 1.6; depth of peduncle 3.5; spine of adipose 5.0; 

 mandibular ramus 3.0 in interorbital; barbel 1.5 in 

 eye; base of the dorsal equal to its distance from the 

 tip of the adipose ; pectoral extending past base of 

 the ventral ; 26 scutes in a longitudinal series ; some 

 of the scutes with ver}' weak keels ; abdo:ninal sur- 

 faces entirely without scales ; supraoccipital bordered 

 posteriorly by a single scute ; supraoccipital convex, 

 almost angular ; orbital rim slightly raised ; small 

 dark spots on the dorsal, pectoral and ventral fins ; 

 otherwise unmarked. The species is notable for its 

 very short body. There is only the type. 



Plecostonms couiiiiersonii, 



( Guvier ^^ Valenciennes ). 



Two specimens 4— to 7 inches long to base 

 of caudal from the State of Santa Gaiharina, two 

 without data of 4 to 6 inches, and three of 6 to 7 

 inches from tlie State of Minas Geraes. 



