212 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 94 



Pimelodella gracilis Eigenmann, Mem. Carnegie Mus., vol. 7, No. 4, p. 238, 

 1917 (La Plata Basin; Uruguay Basin; ? Amazon; ? Orinoco). — Eigenmann 

 and Allen, Fishes of western South America, p. 102, 1942 (Orinoco). 



Pimelodus (Pseudorhamdia) gracilis Steindachnkr, Denksclir. Akad. Wiss. 

 Wien, vol. 41, p. 157, 1879 (Ciudad Bolivar). 



Table 4. — Measurements (in hundredths of the standard length) for species of 



Pimelodella 



Characters 



Standard length (in mm.) 



Length of head to tip of supraoccipital 



Length of head to end of operculum 



Greatest depth at origin of dorsal 



Width of head at base of pectorals 



Length of snout. - - 



Diameter of eye.. 



Least width of fleshy interorbital space 



Postorbital length of head 



Length of maxillary barbel. 



Length of inner mental barbel - 



Length of outer mental barbel -- 



Total length of adipose fin - 



Greatest height of adipose fin 



Least depth of caudal peduncle 



Length of caudal peduncle 



Distance between anterior and posterior nos- 

 trils 



Distance from eye to posterior nostril 



Distance from snout to origin of dorsal 



Distance from snout to origin of anal. - 



Distance from snout to insertion of pelvics . . . 

 Distance from snout to insertion of pectorals. 



Distance from snout to center of anus. 



Anus to anal origin 



Length of longest ray of anal fin... 



Length of first ray of dorsal fin 



Length of longest ray of upper caudal lobe. .. 



Length of longest ray of pelvic fin 



Length of longest ray of lower caudal lobe — 



Length of dorsal spine 



Length of pectoral spine 



linami 

 (holo- 



type) 



75.2 



28.2 



24.1 



18.0 



16.0 



9.84 



5.58 



6.7) 



10.0 



62.5 



14.0 



25.9 



31.0 



4.65 



10.0 



20.6 



3.99 

 3.19 

 32.7 

 69.2 

 47.5 

 24.1 

 54.0 

 15.6 

 12.6 

 38.7 

 39.9 

 13.7 

 26.6 

 14.0 

 14.5 



chagresi chagresi 



Rio Chama 

 system 



28.0 



23.2 



18.7 



17.4 



10.0 



4.8) 



6.90 



10.1 



65.0 



14.6 



25.6 



32.4 



5.60 



8.45 



19.6 



2.91 

 3.69 

 33.3 

 69.2 

 45.8 

 20.4 

 52.0 

 15.5 

 11.8 

 18.2 

 31.1 

 15.0 

 22.1 

 13.1 

 15.0 



83.1 



28.9 



24.4 



19.3 



18.1 



10.8 



4.45 



7.22 



10.6 



61.4 



15.6 



25.9 



30.8 



4.9 



8.19 



20. 



3.73 

 3.73 

 34.4 

 67.6 

 44.6 

 21.2 

 51.8 

 16.5 

 13.2 

 19.1 

 28.9 

 13.8 

 20.1 

 13.2 

 14.4 



U.S.N.M. 

 No. 78256 



Upper 

 Trinida'l, 

 Panama 



86.0 

 30.5 

 25.0 

 17.6 

 17.4 

 9.81 

 6.16 

 5.93 

 10.0 

 61.6 

 10.5 

 21.5 

 31.1 

 5.23 

 8.14 

 19.5 



3.72 

 3.49 

 35.5 

 67.1 

 47.2 

 23.3 

 54.2 

 12.8 

 12.0 

 21.5 

 29.8 

 13.4 

 23.3 

 15.3 

 17.1 



102.5 

 29.7 

 23.9 

 18.5 



chagresi odynea 



Rto 

 T&- 

 chira 



(para- 

 type) 



Rio Motatin 

 system 



9.2' 

 5.56 

 5.95 

 9.37 

 63.4 

 14.1 

 23.9 

 33.2 

 4.68 

 8.30 

 21.0 



3.61 

 3.61 

 33.7 

 66.9 

 47.1 

 22.5 

 54.6 

 13.7 

 12.5 

 19.5 

 28.3 

 14.8 

 23.9 

 16.1 

 18.1 



75.3 



28.7 



22.6 



19.9 



17.4 



9.56 



5.71 



5 



8.76 

 81.6 

 14.6 

 26.5 

 32.5 

 5.18 

 8.63 

 22.4 



3.32 

 3.32 

 33.3 

 65.0 

 46.6 

 21.4 

 51.3 

 12.6 

 12.6 

 20.0 

 35.8 

 14.5 

 25.4 

 13.9 

 15.1 



Para- 

 type 



Para- 

 type 



92 

 28.4 

 23.9 

 18.6 

 18.5 

 10.1 

 4.90 

 7.06 

 10.0 

 75.0 

 17.9 

 28.9 

 32.1 

 6.20 

 8.80 

 21.7 



3.80 

 3.80 

 32.6 

 66.5 

 46.2 

 21.7 

 52.6 

 13.6 

 12.5 

 19.6 



14.1 



23.8 

 14.1 

 14.9 



82.5 

 28.3 

 22.0 

 17.7 

 16.4 

 8.60 

 5.58 

 6.54 

 9.45 

 93.3 

 20.0 

 32.7 

 31.5 

 6.54 

 7.8) 

 21.3 



3.15 

 3.27 

 32.7 

 67.8 

 44.8 

 21.3 

 50.5 

 16.6 

 13.3 

 20.0 

 36.4 

 16.4 

 26.0 

 20.0 

 19.4 



IIolo- 

 type 



89 

 28.2 

 22.4 

 17.0 

 16.4 

 9.10 

 5.06 

 6.86 

 8.76 

 96.5 

 16.2 

 36.0 

 34.8 

 4.94 

 7.7.1 

 20.9 



3.37 

 3.48 

 33.2 

 68.fi 

 44.4 

 19.8 

 52.7 

 15.8 

 12.6 

 21.7 

 33.2 

 14.7 

 23.8 

 15.5 

 15.8 



PIMELODELLA METAE Eigenmann 



Pimelodella metae Eigenmann, Mem. Carnegie Mus., vol. 7, No. 4, p. 244, pi. 

 31, fig. 2, 1917 (Quebrada Cramalote and PJo Negro, near Villavicencia; 

 Barrigona, Rfo Meta; all Colombia); Indiana Univ. Studies, vol. 7, No. 44, 

 p. 5, 1920 (Maracay, Rfo Bue, and Rio Castano, all Valencia Basin, Vene- 

 zuela). — Pearse, Univ. Wisconsin Studies, No. 1, p. 22, 1920 (mouth Rfo 

 Bue).— Eigenmann, Mem. Carnegie Mus., vol. 9, No. 1, p. 222, 1922 (Lake 

 Valencia Basin). 



IPimelodeUa buckleyi Ribeiro, Rev. Mus. Paulista, vol. 10, p. 731, 1918 (Rfo 

 Cabriale, Venezuela). 



