52 PROCEEDENGS OF THE NATIONAL MUSEUM vol. 99 



U.S.N.M. No. 121757, 84 specimens, 20 to 80 mm., from the Rio de Los Pdjaros, 

 3 km. above Lago de Maracaibo, April 30. 



U.S.N.M. No. 121755, 1 specimen, 24 mm., from a pool in drying-up Rio San 

 Ignacio about 20 km. south of Rosario, February 26. 



U.S.N.M, No. 121754, 2 specimens, 32 and 34.5 mm., off dock at Lagunillas 

 in Lago de Maracaibo, April 14. 



Figure 8. — Lycengraulis limnichthys, new species: Holotype (U.S.N.M. No. 121751), 92 

 mm. in standard length. Drawn by Mrs. Aime M. Awl. 



Description. — Certain measurements were made, and these data, 

 recorded below, are expressed in hundredths of the standard length, 

 first for the holotype, then for two paratypes in parentheses, respec- 

 tively. Standard lengths in millimeters 94.0 (48.1; 118.5). 



Length of head 27.7 (25.6; 25.2); greatest depth of body 23.6 (20.8; 

 22.1); length of snout 4.78 (4.16; 4.47); diameter of eye 6.70 (7.69; 

 6.07); distance from tip of lower jaw to rear of joint of mandible 18.2 

 (16.6; 18.0); distance from snout tip to rear of maxillary 21.6 (19.7; 

 21.1); greatest width of interorbital 5.64 (6.03; 5.06); postorbital 

 length of head 16.0 (14.3; 15.3); length of cheek 10.1 (8.11; 10.5); 

 length of longest gill raker on first gill arch 3.08 (4.36; 2.45); length of 

 longest ray of dorsal fin 16.0 (15.4; 14.1), of anal fin 13.3 (12.9;—), 

 of pectoral fin 19.1 (18.7; 17.3), of pelvic fin 9.56 (10.4; 8.69), and of 

 lower lobe of caudal fin 27.1 (25.8; — ); shortest midcaudal fin ray 

 7.76 (9.59; 7.34); length of base of anal fin 24.5 (24.1; 22.4); length of 

 base of dorsal fin 11.2 (11.2; 13.0); distance from pelvic insertion to 

 anal origin 19.9 (18.3; 20.5); tip of snout to dorsal origin 54.8 (53.2; 

 54.4); snout to anal origin 62.4 (60.9; 59.9); snout to pectoral insertion 

 27.4 (27.4; 24.7); and to pelvic insertion 44.2 (42.6; 38.4); length of 

 caudal peduncle 18.8 (18.3; 19.0); least depth of caudal peduncle 10.0 

 (9.77; 10.1). 



The following counts were made, respectively: Dorsal rays iii, 12 

 (iii, 12; iii, 12); anal rays iii, 22 (iii, 22; iii 22); pectoral rays ii, 14-ii, 

 15 (ii, 13-ii, 14; ii, 14-ii, 14); pelvic rays always i, 6; scales 42 (42; 43). 



Body compressed, rather slender, its greatest depth 4.3 to 4.9; 

 depth of head at joint of mandible about four-fifths of postorbital 



