204 



PROCEEcDINGS OF THE NATIONAL MUSEUM 



VOL. 94 



U.S.N. M. No. 121145, Rfo de Los Pajaros, 3 km. above Lago Maracaibo, 

 April 30, 1942, 6 specimens, 123 to 158 mm. 



U.S.N. M. No. 121159, Lago Maracaibo at Yacht Club, Maracaibo, March 5, 

 1942, 2 specimens, 123 and 148 mm. 



U.S.N. M. No. 121158, Lago Maracaibo, 1 km. off Pueblo Viejo, April 7-9, 

 1942, 2 specimens, 230 to 239 mm. 



U.S.N. M. No. 121147, Rio Palmar near Totuma, about 100 km. southwest of 

 Maracaibo, February 21, 1942, 25 specimens, 117 to 154 mm. 



U.S.N. M. No. 121157, Rio Palmar at bridge 70 km. southwest of Maracaibo, 

 March 6, 1942, 5 specimens, 110 to 159 mm. 



U.S.N.M. No. 121152, Ci^naga del Guanavana about 10 km. north of Sinamaica, 

 March 11, 1942, 1 specimen, 195 mm. 



U.S.N.M. 121156, Rio Socuy, 3 km. above its mouth, Maracaibo Basin, Febru- 

 ary 24, 1942, 15 specimens, 125 to 218 mm. 







Figure 2. 



-Pimelodus clarias coprophagus, new subspecies: Holotype (U.S.N.M. No. 

 121150), 163 mm. in standard length. 



U.S.N.M. No. 121148, Rio Ap6n, about 35 km. south of Rosario, Maracaibo 

 Basin, February 26, 1942, 31 specimens, 118 to 192 mm. 



U.S.N.M. No. 121155, Rio Negro below mouth of Rio Yasa, March 2, 1942, 

 7 specimens, 118 to 195 mm. 



U.S.N.M. No. 121149, cano half a mile west of Sinamaica, March 11, 1942, 5 

 specimens, 162 to 176 mm. 



U.S.N.M. No. 121151, Rio Motatdn at bridge 22 km. north of Motatdn, March 

 17, 1942, 11 specimens, 117 to 167 mm. 



U.S.N.M. No. 121146, Rio Motatdn 8 km. below Motatdn, March 24, 1942, 

 1 specimen, 128 mm. 



Description. — Certain features on the holotype and two paratypes 

 were carefully measured, and the resultmg data, expressed in hundredths 

 of the standard length, are recorded in table 3. The following counts 

 were made on the holotype and paratypes, respectively: Dorsal rays 

 I, 6; I, 6; I, 6; anal v, 9; v, 9; v, 9; pectoral I, 9; I, 9; I, 9; pelvic i, 5; 

 i, 5; i, 5; branched rays of caudal fin 15; 15; 14; number of gill rakers 

 on first gill arch — ; 94-24; 8+23. Additional counts in table 2. 



Upper surface of head bony, the supraoccipital process with broad 

 base tapering to a rounded point posteriorly, touching but not fused 

 with the predorsal plate; eye with free margin; premaxillary band of 



