THE CATFISHES OF VENEZUELA — SCHULTZ 229 



PERRUNICHTHYS, new genus 



This new genus of pimclodid catfish, with a greatly depressed head 

 anteriorly, difi'ers from all other genera of the subfamily Sorubiminae 

 in its very small patches of villiform teeth on palatines and vomer, the 

 latter with their long axis running transversely. The two palatine 

 patches are widely separated from the vomerine patches, all teeth 

 uniform. The premaxillary band of teeth does not have posteriorly 

 projecting angles laterally, but the ends are rounded. In the adult 



Figure 3. — Sketches of the toothed areas in roof of mouth of various species of South Ameri- 

 can Pimelodidae: a, Pseudoplatystoma fasciafum; b, Duopalatinus emarginatus; c, Paulicea 

 liltkeni (after Ribeiro); d, Perrunichthys perruno; e, Brachyplaiy stoma vaillanti (after 

 Ribeiro);/, Platystomatichihys sturio; g, Platysilurus malarmo: h. Sorubim lima. 



