Vol. 30, pp. 145-146 July 27, 1917 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW GENERA OF DEEP-WATER GURNARDS (PERI- 

 STEDIIDAE) FROM THE PHILIPPINE ISLANDS. 



BY HUGH M. SMITH. 



The Philippine collections of the "Albatross " are very rich 

 in peristedioid fishes as regards both individuals and species. 

 The most interesting specimens are those representing two 

 hitherto undescribed genera which necessitate a modification of 

 the definition of the Peristediidae. 



The new genera have been named Gargariscus and Hemi= 

 nodus, and their outstanding differential character is that the 

 upper jaw is toothed, whereas Peristedion is edentulate in both 

 jaws. The following key shows the relationships of the three 

 genera: 



A. Both jaws toothless Peristedion. 



AA. Only lower jaw toothless. 



b. Cephalic shield much expanded, flattened, the margin cre- 

 nate; rostral processes long and flat; barbels very highly 

 developed; mouth moderate; teeth on premaxillaries 

 in a broad band extending half distance to angle of 



mouth Gargariscus. 



bb. Cephalic shield little expanded, the margin entire ; rostral 

 processes short and spine-like, not flattened ; barbels 

 short and few; mouth very large; teeth on pre- 

 maxillaries in a broad band extending to angle of 

 mouth Heminodus. 



Gargariscus, new genus. 



Similar to Peristedion in general appearance, but with cephalic shield 

 more expanded and its edge deeply crenated ; premaxillaries bearing a 

 broad band of fine teeth extending from symphysis half way to angle of 

 mouth. 



34— Proc. Biol. Soc. Wash.. Vol. 30. 1917. (145) 



