220 PROCEEiDINGS OF THE NATIONAL MUSEUM vol. 94 



6b. Distance from pelvic insertion to anal origin 1.6 to 1.9 times in snout 

 to pelvic insertion; total length of adipose fin 5.4 to 6^^ times 

 in standard length and 1.6 to 2.0 in distance from dorsal origin 

 to adipose origin. 

 la. Shortest midcaudal fin rays in total length of adipose fin 2, in 

 dorsal origin to adipose origin about 3.4, and in longest rays of 

 caudal fin about 3 times; head AV2, depth 5 in standard length; 

 color plain blackish without pale caudal fin sharply contrasting 

 with black caudal base; a white spot at origin of dorsal fin. 

 Cetopsorhamdia insidiosa (Steindachner) 

 76. Shortest midcaudal fii> ray 1.5 to 1.7 in total length of adipose 

 fin, 3.0 to 3.2 in dorsal origin to adipose origin, and 2.7 to 

 2.9 in longest (lower lobe) rays of caudal fin; head 3.8 to 4.0 

 and width across pectoral bases 5 to 5.5 in standard length; 

 caudal fin white, sharply contrasting with blackish caudal base; 

 a narrow pale bar over occiput connecting across upper ends of 

 gill openings; a white spot at origin of dorsal fin; a short narrow- 

 white aiea along middorsal line of caudal peduncle just in 

 front of bases of upper caudal rays; midventral line of caudal 



peduncle wliite Cetopsorhamdia picklei, new species 



56. Distance from pelvic insertion to anal origin 3 times in snout to 

 pelvic insertion; length of shortest midcaudal fin rays into longest 

 rays of lower lobe of caudal fin 3.2 times; head 4 to 4.3 times in 

 standard length; everywhere darkish in color dorsally; a dark 

 band at base of caudal and a light band about width of eye extend- 

 ing between upper margins of gill openings across base of occipital: 

 a pale spot at dorsal origin. 



Cetopsorhamdia nasus Eigenmann and Fis])er* 

 2b. Greatest height of adipose fin 5 to 7 times in its total length; origin of 

 adipose fin nearly over middle of anal fin base; anal origin to midbase 

 of caudal fin contained 1% times in snout to anal origin; total length 

 of adipose fin 4.2 to 4.3, and head 4, width of head across base of pec- 

 torals about 5, all in standard length; a pale bar between upper ends 

 of gill openings across occiput; a wide, somewhat obscure, pale bar 

 between dorsals and another across caudal peduncle; base of caudal fin 

 black; sometimes a pale spot on half-grown at origin of adipose fin; no 

 pale spot at origin of dorsal fin; no black color extending up on basal part 

 of caudal fin rays; length of shortest midcaudal fin rays, 1.7 in total 

 length of adipose fin, 2.0 in longest ray of caudal fin, and 2.7 in distance 

 from d<.>rsal origin to adipose origin. 



Cetopsorhamdia Orinoco, new sj)ecies 



CETOPSORHAMDIA SHERMANI. new species 



Plate 2, C 



//o/of2//>c.— U.S.N. M. No. 121216, the only known specimen, 30.7 

 mm. in standard length, collected by J^eonard P. Sclmltz, Guillenno 

 Zuloaga, Roger Sherman, and William Phelps, Jr., May 12, 1942, in 

 the Rio Guarico and tributaries between San Sebastian and San 

 Casirairo (Orinoco system), Estado de Aragua, Venezuela. 



Description. — Detailed measurements are expressed in hundredths 

 of the standard length: 



• Cetopsorhamdia nasus Eigenmann and Fi.»;her, Ann. C\irn(-pie Mas., vol. 10, p. 83, 1916 (Honda). 



