SOUTH AMERICAN NEMATOGNATHI. 159 



I Oxydoras. 



202. Oxydoras niger ( Valeucieuues . ) 



Doras humholdti Agassiz; Gorydoras edentatus Spix; Rhinodoras prio- 

 nomus Cope. Rhinodoras teffeanus Steindachuer. 



Localities: Teflfe (types of teffeanus?); Gurupa; Maucapuru; Coary; 

 Obidos. 



203. Oxydoras knerii Bleeker. 



§ Rhinodoras. 



204. Oxydoras d'orbigny Kroyer. 



205. Oxydoras Amazonum (Steindacliner.) 



XLV. Doras Lacepede. 



Centrochir Agassiz; Lithodoras, Ptcrodoras, Platydoras, 

 Acanthodoras, Astrodoras d: Amhlydoras Bleeker; Zathorax & 

 Agamyxis Cope. 



§ Lithodoras. 



206. Doras dorsalis Cuv. Val. 



Doras papilionatus Filippi; Doras lilhogaster Heckel. 

 Locality: Para. 



§ Doras. 



207. Doras uranoscopus sp. nov. 



Type, No. 7235, one specimen .54 m. Lake Hyauuary. Navez. 



Body rather heavy, depressed, depth below the dorsal 

 spine f as great as the width; caudal peduncle rather slen- 

 der, wider than high. Width of the head I5 in its length; 

 top of the head to near tip of snout, opercle, preopercle, 

 suborbital and pre-nasal bones striate, the strife becoming 

 broken up into granules in places, which, on the dorsal plate 

 ^re spine-like, similar to those on the lateral scutes. Dor- 

 sal plate not continued behind the anterior margin of the 

 dorsal spine, with a downward directed process. Interor- 

 bital area flattish; posterior portion of the head obtusely 

 keeled. Fontanel club-shaped, not extending to the pos- 

 terior margin of the eye; an elongate diamond-shaped 

 depressed area behind it. 



