338 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
TETRAGONOPTERUS ARGENTEUS Cuvier 
Tetragonopterus argenteus CuvireR, Mem. Mus. Hist. Nat., vol. 4, p. 455, 1818.— 
STEINDACHNER, Denkschr. Akad. Wiss. Wien, vol. 41, p. 155, 1879 (Ciudad 
Bolivar).—E1GENMANN and EIGENMANN, Proc. U. S. Nat. Mus., vol. 14, 
p. 52, 1891 (Orinoco).—PELLEGRIN, Bull. Mus. Hist. Nat. Paris, vol. 5, p. 
157, 1899 (Apure River, Venezuela).—EicenMann, Mem. Mus. Comp. 
Zool., vol. 43, pt. 1, p. 55, 1917 (Orinoco to Buenos Aires).—EIGENMANN and 
ALLEN, Fishes of western South America, p. 237, 1942 (Orinoco Basin to 
the La Plata). 
TETRAGONOPTERUS CHALCEUS Agassiz 
Tetragonopterus chalceus AGAssiz, in Spix, Selecta genera et species piscium... 
Brasiliam ..., p. 70, pl. 33, fig. 1, 1829 (ref. copied).—PELLEGRIN, Bull. 
Mus. Hist. Nat. Paris, vol. 5, p. 157, 1899 (Apure River, Venezuela). 
Genus MOENKHAUSIA Eigenmann 
Moenkhausia E1GENMANN, Smithsonian Misc. Coll., vol. 45, p. 145, 1903. (Type, 
Tetragonopterus xinguensis Steindachner.) 
KEY TO THE SPECIES OF MOENKHAUSIA AS REPORTED FROM VENEZUELA IN THE 
LITERATURE 
la. Anal rays iii, 29 to iii, 38; scales 8 or 9+30 to 32++8 or 9 (? 10); predorsal 
scales 14 or 15; depth 2, head 3% to 3%; no caudal spot; fins not elongate; 
grayish humeral spot present____._______- Moenkhausia bondi (Fowler) 
1b. Anal rays iii, 24 to iii, 27; scales about 7+35-+6: depth 2% to 2%, head 4; fins 
all elongate, depressed dorsal reaching past adipose; no caudal or humeral 
spots; a narrow lateral band________- Moenkhausia pittieri Kigenmann 
1c. Anal rays iii, 23 to iii, 24; scales 7+35 or 36+6; depth 2% to 2%, head 3% to 
3%; a blackish round caudal spot; no distinct humeral spot or dark lateral 
FS} F127) co ty AU Tr ES A Moenkhausia miangi Steindachner 
None of the three species listed here for the genus Moenkhausia has 
been examined by me. 
MOENKHAUSIA BONDI (Fowler) 
Phenacogaster bondi FowuErR, Proc. Acad. Nat. Sci. Philadelphia, vol. 68, p. 419, 
1911 (Corisal, Orinoco Delta, Venezuela). 
Moenkhausia bondi E1GENMANN, Mem. Mus. Comp. Zool., vol. 43, pt. 1, p. 69, 
pl. 14 fig. 3, pl. 100 fig. 7, 1917 (Venezuela). 
MOENKHAUSIA PITTIERI Bigenmann 
Moenkhausia pittieri EIGENMANN, Indiana Univ. Stud., No. 44, p. 10, pl. 3, 1920 
(Concejo, Rio Tiquirito; Maracay, Rio Bue, all in Valencia Basin, Vene- 
zuela).—EIGENMANN and Mymrs, Mem. Mus. Comp. Zool., vol. 43, pt. 5, 
n. 520, 1929 (Concejo, Rio Tiquirito; Maracay, Rio Bue, Venezuela). 
MOENKHAUSIA MIANGI Steindachner 
Moenkhausia miangi STHINDACHNER, Denkschr. Akad. Wiss. Wien, vol. 93, p. 43, 
pl. 3, fig. 5, 1917 (Rio Miang, border of Venezuela).—E1GENMANN and MYERs, 
Mem. Mus. Comp. Zool., vol. 48, pt. 5, p. 525, 1929 (Rio Miang). 
Genus BRYCONAMERICUS Eigenmann 
Bryconamericus EIGENMANN, Ann. Carnegie Mus., vol. 4, p. 189, 1907. (Type, 
Bryconamericus exodon Higenmann.) 
