252 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
of the fishes in the British Museum, vol. 5, p. 293, 1864 (Lago Maracaibo) .— 
STEINDACHNER, Denkschr. Akad. Wiss. Wien, vol. 48, p. 137, 1882 (Lagoon of 
Maracaibo).—H1gENMANN and HicgENMANN, Ann. New York Acad. Sci., 
vol. 4, p. 24, 1889 (Lago Maracaibo). 
Anodus laticeps EIGENMANN and ALLEN, Fishes of western South America, p. 300, 
1942 (Lago Maracaibo). 
See table 2 for certain counts made on this species from the Mara- 
caibo Basin. 
The following collections were made by Leonard P. Schultz during 
1942, in the Maracaibo Basin of Venezuela: 
U.S.N.M. No. 121321, 3 specimens, 149 to 152 mm., taken in the Rio Negro 
below mouth of Rio Yasa, March 2. 
U.S.N.M. 1213238, 4 specimens, 128 to 159 mm., from the Rfo Palmar at the 
bridge, 70 km. southwest of Maracaibo, March 6. 
U.S.N.M. No. 121322, specimen, 130 mm., from pool in Rio San Ignacio, 20 
km. south of Rosario, February 26. 
U.S.N.M. No. 121320, 9 specimens, 207 to 255 mm., from the Rfo Apén about 
35 km. south of Rosario, February 26. 
TABLE 2.—Counts made on Anodus laticeps from the Maracaibo Basin 
Number of fin rays Number of scales in reference to lateral line 
ave Anal Pectoral Pelvic | Rows fom eulonening tomid-| Above Below 
i,9 | 113 | 114 | 115 | 116 | 117 | 118 | 26 | 27 | 25 | 26 | 27 
— | —_———_ |_ ——————._ | | —————_ | | | | | | | 
ii, 9 |ii, 13 | ii, 14| i, 15) i, 16} i, 17] i, 8 
Subfamily SERRASALMINAE 
KEY‘ TO THE GENERA AND SPECIES OF SERRASALMINAE REPORTED FROM 
VENEZUELA 5 
la. Teeth in a single series in both jaws; teeth with a strong median cusp and with 
either a single lateral cusp or a pair, those of upper Jaw mostly asymmetrical 
(Serrasalmus). 
2a. Head broad, with upper profile straight or convex; length 234 to 3 in total 
length (without caudal); snout short, blunt; second suborbital deeper 
than eye, covering or nearly covering cheek; interorbital width 144 to 2% 
in length of head; lower jaw very heavy; palatines toothless; distance 
between rayed dorsal and adipose fin 2 to 3% in base of former; adipose 
fin not rayed; fewer than 40 ventral serrae; base of rayed dorsal equal to 
or greater than distance from upper caudal fulcra; anterior profile only 
moderately arched; base of rayed dorsal 2% to 2% in depth of body, 2 to 
2% times distance from adipose fin_____-_ Serrasalmus nattereri (Kner) 
2b. Head narrower, with upper profile more or less concave above eyes; length 
2% to 3% in total length (without caudal); lower jaw not very heavy; 
4 Modified after Norman’s review of this subfamily in Proc. Zool. Soc. London for 1928, pp. 781-829, pl. 1, 
figs. 1-20, 1928. 
5 Pygocentrus palometa Valenciennes, in Cuvier and Valenciennes, Histoire naturelle des poissons, vol. 
22, D. 296, 1849 (Rio Apure, Rio Guarico), is not recognizable at present from his description. 
