SOUTH AMERICAN NEMATOGNATTTI. 45 



82. Pterygoplichthys punctatus Natteier. 



. Ancistrus duodecimalls Kner. 

 Locality: Cudajas, 



83. Pterygoplichthys pardalis Casteiuau. 



Liposarcus varius Cope. 



Localities: Santarem; Cudajas; Kio Negro; Teffe; Jiitahy; Villa Bella; 

 Obidos; Tabatiuga. 



84. Pterygoplichthys jeanesianus Cope. 



85. Pterygoplichthys lituratus Kuer. 



Localities: Rio Preto; Eio Puty; Sao Goiigallo; Xiugu Cascade. 



XVII. PsEUDANCiSTRUS Bleeker. 



86. Pseudancistrus barbatus (Cuv. & Val.). 



87. Pseudancistrus guttatus (Cuv. & Val.). 



88. Pseudancistrus depressus (Giiutber). 



89. Pseudancistrus setosus (Boulenger). 



90. Pseudancistrus wertheimeri Steiudachner. 



Locality: Santa Clara, Rio Mucnri. 



XVIII. Delturus gen. nov. 



Type: Delturus j)urahyhcB sp. nov. 



Dorsal fin adnate; lateral plates well developed; sides of 

 the head with short fine bristles which do not encroach on 

 the preopercle. Tail fiat below, trenchant above, a cross 

 section being A-shaped. 



91. Delturus angulicauda Steiudachner. 



Locality: Santa Clara, Rio Mucuri. 



92. Delturus parahybse sp. nov. 



Types, No. 772(;; two specim^ris .28 m. Parabyba. Tbayer expedi- 

 tion. 



The differences between the two species of this genus ma}^ 

 best be seen from the following key: 



a. D. I, 9. Fins plain; lat. 1. 24. angulicauda. 



aa. D. I, 10. Fins all spotted; lat. 1. 25-27. loamhyhce. 



