234 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 94 



PLATY8ILURUS MALARMO, new species 



Malarmo 

 Figure 3, g; Plate 3, C 



Holotype.—V. S. N. M. No. 121179, a specimen 316 mm. in 

 standard length, collected by Leonard P. Scliultz on May 2, 1942, in 

 Lago Maracaibo, near the mouth of the Rio Concho. 



Paratypes (all collected by L. P. Schultz).— U.S.N. M. No. 121182, 

 4 specimens, 276 to 328 mm., Rio Socuy, 3 Ion. above mouth, Febru- 

 ary 24, 1942; U.S.N.M. No. 121201, a specimen 560 mm., same data; 

 U.S.N.M. No. 121180, 4 specimens, 223 to 323 mm., Rio Negro below 

 mouth of Rio Yasa, March 2, 1942; U.S.N.M. No. 121181, 4 specunens, 

 288 to 350 mm., Rio Ap6n, about 35 km. south of Rosario, Maracaibo 

 Basin, February 26, 1942. All these specimens came from deep pools 

 over sandy to muddy bottoms. 



Description. — Based on the holotype and paratypes listed. Meas- 

 urements for these, expressed in hundredths of the standard length, 

 first for the holotype, then for the paratype in parentheses, respec- 

 tively, are given below. Standard length (in mm.) 316 (223). 



Length of head from tip of snout to tip of supraoccipital process 

 38.9 (38.3); length of head to end of operculum 34.5 (34.1); greatest 

 depth 18.7 (15.5); width of head at base of pectorals 20.0 (19.3); 

 length of snout 19.3 (19.5) ; postorbital length of head (to end of oper- 

 culum) 12.2 (11.9); width of snout through corners (rictus) of mouth 

 12.7 (12.6); diameter of eye 3.16 (3.95); width of fleshy interorbital 

 space 7.55 (7.62) ; length of maxillary barbel 194.5 (to where filament 

 begins 161); length of outer mental barbel 22.0 (16.8); length of inner 

 mental barbel 12.3 (10.3); total length of adipose fin 17.5 (17.8); 

 greatest height of adipose fin 5.44 (7.18) ; length of base of anal fin 9.82 

 (10.5) ; least depth of caudal peduncle 5.85 (4.93) ; length of caudal 

 peduncle 16.2 (16.2); distance from anterior to posterior nostril 4.55 

 (5.16) ; distance from eye to posterior nostril 13.0 (12.4) ; tip of chin to 

 base of inner or anterior mental barbel 12.7 (12.6) ; tip of chin to outer 

 or posterior mental barbel 13.0 (11.4); snout to origin of dorsal fin 

 43.1 (42.6); snout to origin of anal 76.6 (74.9); snout to origin of adi- 

 pose fin 71.2 (69.5) ; snout to insertion of pelvics 55.4 (52.0) ; snout to 

 insertion of pectorals 33.4 (29.7); anus to anal origin 17.1 (17.1); 

 snout to anus 60.1 (57.8); length of dorsal spme 17.6 (— ); length of 

 pectoral spine 21.7 (23.6); length of longest ray of pelvics 15.2 (12.7) ; 

 length of longest ray of anal 13.8 (12.6) ; length of longest ray of upper 

 lobe of caudal fin 51.2 (38.6 with tip broken off) ; length of longest ray 

 of lower lobe of caudal fin 39.5 (— ) ; length of shortest midcaudal fin 

 ray 10.3 (7.2). 



