262 PROCEEiDINGS OF THE NATIONAL MUSiElTM vol.94 



U.S.N. M. No. 121234, 2 specimens, 29 and 65.5 mm., collected by Leonard 

 P. Schultz, March 31, 1942, in the Rfo Cobrc above its mouth, tributary to Rio 

 Quinta, thence Rio La Gritcv, Catatumbo system; U.S.N. M. No. 101616, an 

 example 53.5 mm., collected by Nic6foro Maria in the Rio Pamplonita near 

 Cucuta, Colombia (Catatuml)o system). 



Certain measurements were made on two specimens of knerii, the 

 first from the Rio Torbos and the other from the Rio Cobre; these 

 data, expressed in hmidredths of the standard k^ni^th, respectively, 

 are recorded below. Standard length (in mm.) 71.2, 64.7. 



Length of head to end of opercle 19.2, 19.3; greatest depth 15.7, 

 16.2; length of longest pelvic ray 9.97, 10.2; length of upper prolonged 

 ray of pectoral 14.9, 16.2; distance from tip of snout to origin of dorsal 

 64.0, 64.2; snout to pelvic insertion 54.8, 59.5; snout to anal origin 

 71.4, 74.2; distance from dorsal origin to tip of caudal fin 52.5, 52.8; 

 pelvic insertion to tip of caudal fin 61.0, 60.1; distance from pelvic 

 insertion to anal origin 15.9, 15.3; length of snout 8.85, 8.50; post- 

 orbital length of head 9.13, 8.81; interorbital space 5.62, 6.18; length 

 of nasal barbel 16.3, 14.8; length of upper maxillary barbel 19.8, 18.6. 



For counts of fin rays see table 11. 



PYGIDIUM BANNEAUI MARACAIBOENSIS, new subspecies 



Plate 6, B 



Holotype. — U.S.N.M. No. 121227, a specimen 43.7 mm. in standard 

 length, collected by Leonard P. Schultz, March 17 and 20, 1942, in 

 the Rio San Juan near bridge, south of Alene Grande, tributary to 

 Rio Motatan, Maracaibo Basin. 



Paratypes (aU collected by L. P. Schultz) .—U.S.N.M. No. 121228, 

 5 examples, 31 to 56 mm., taken along with the holotype and bearing 

 the same data; U.S.N.M. No. 121229, 16 specimens, 31.5 to 48.6 

 mm., from the Rio ALachango, 20 km. above the bridge south of 

 Lagunillas, Maracaibo Basin, March 21, 1942; U.S.N.M. No. 121231, 

 2 specimens, 33.5 and 65 mm., from the Rio Motatan, 4 km. above 

 Motatan, March 25, 1942; U.S.N.M. No. 121230, an example 50.7 

 mm., from the Rio Palmar near Totuma, about 100 km. southwest of 

 Maracaibo, February 21, 1942. 



Description. — Based on the holotype and paratypes listed above. 

 Measurements of the holotype and two paratypes, expressed in hun- 

 dredths of the standard length, are recorded below, first for the holo- 

 type followed by those for the paratypes in parentlieses, respectively. 

 Standard length (in mm.) 43.7 (46.5; 33.5). 



Length of head to end of opercle 20.1 (19.3; 20.3); width of head 

 across base of pectorals 15.6 (15.3; 15.2); greatest depth 15.6 (19.3; 

 14.3); length of snout 8.70 (8.17; 8.36); diameter of eye 2.29 (1.93; 

 2.39); interorbital space (fleshy) 5.26 (5.38; 5.97); postorbital length 

 of head 10.3 (11.2; 10.4); length of longest or first branched ray of 



