1915.] ■ NATURAL SCIENCES OF PHILADELPHIA. 209 



New Jersey (Assanpink Creek, Trenton), Pennsylvania (Millan- 

 ville, Dingman's Ferry, Delaware Water Gap, Schuylkill River, 

 Holmesburg, Susquehanna River, Conestoga Creek, Lopez, Paradise, 

 Altoona), Maryland (Conowingo, G>Tin Oak), Mrginia (Sinking 

 Creek), North Carolina (Yadkin and Catawba Rivers), Missouri 

 (Carthage). 



Schilbeodes exilis (E. W. Nelson). 



Brook River, Iowa. 



PIMELODIN^. 

 Zungaro zungaro (.Humboldt). 



Peruvian Amazon. 



Khamdia sebae (Valenciennes). 



Surinam and Peruvian Amazon. 

 Ehamdia vilsoni (Giin. 



Trinidad, British West Indies. 



Rhamdia riojae sp. nov. Fig. 2. 



Pimelodus humilis (non Giinther) Cope, Proc. Amer. Philos. Soc. Phila., 

 XVII, 1878, p. 674. Rioja, near Moyabamba. 



Head 4^; depth 5|; D. I, 6; A. v, 7; P. I, 8; V. i, 5; head width 

 1 J in its length; head depth at occiput If ; snout 3; eye 7; maxillary 

 3|; mouth width 2f ; interorbital 2f ; dorsal spine 2; first branched 

 anal ray 2i; least depth of caudal peduncle 2|; pectoral If; ventral 



Body compressed, elongate, rather slender, deepest at dorsal 

 origin, and edges all convex. Caudal peduncle well compressed, 

 least depth equals its length. 



Head depressed, broadly convex above, more or less flattened 

 below, profiles mostly similar. Snout wide, broadly convex over 

 surface, length i its greatest width. Eye ellipsoid, close to upper 

 profile and its hind edge little anterior in head length. Eyelids 

 free, not adipose-like. Mouth broad, transverse, and upper jaw 

 slightly protruded. Teeth in villiform bands in jaws, simple, sharply 

 pointed, and bands continuous medianly. No vomerine teeth, 

 though all vomerine and palatine regions with wdde-spaced minute 

 papillse. Tongue wide, thick, fleshy, depressed, not free. Maxillary 

 barbel extends to ventral origin. Outer mental barbel reaches tip 

 of depressed pectoral spine, and inner extends | to pectoral origin. 

 Posterior internasal area slightly less than anterior. Anterior 

 nostrils near snout edge, in short tubes. Posterior nostril about 

 first I in snout length, ^\ith low cutaneous edge. Interorbital 

 14 



