302 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
5b. Humeral spot about size of pupil; depth of body 2.9 to 3.4 in standard 
length. 
6a. Branched anal rays 48 to 55; depth about 3 to 3.4; head 4.2 to 4.33 
(Rio Magdalena). 
Cyrtocharax magdalenae magdalenae (Steindachner) 
6b. Branched anal rays 45 to 48; depth about 3; head about 3.7 to 4. 
(Rio Atrato). 
Cyrtocharax magdalenae atratoensis (Higenmann) 
6c. Branched anal rays usually 42 to 47; depth about 3; head about 3.5 to 
3.8 (Maracaibo Basin). 
Cyrtocharax magdalenae venezuelae, new subspecies 
6d. Branched anal rays 39 to 44; depth about 3; head about 3.66 to 3.75 
(British Guiana): 
Cyrtocharax magdalenae essequibensis (Eigenmann) 
CYRTOCHARAX BIPUNCTATUS (Pellegrin) 
Cynopotamus bipunctatus PELLEGRIN, Bull. Mus. Hist. Nat. Paris, vol. 15, No. 1, 
p. 18, 1909 (mouth of Rio Suripa, Apure system, Venezuela). 
Genus GILBERTOLUS Eigenmann 
Gilberiella EIGENMANN, Smithsonian Mise. Coll., vol. 45, p. 147, 1903. (Type, 
Anacyrtus (Raestes) alatus Steindachner.) 
Gilbertolus EIGENMANN, in Eigenmann and Ogle, Proc. U. S. Nat. Mus., vol. 33, 
p. 3, 1907 (replaces Gilbertella, preoccupied). 
KEY TO THE SUBSPECIES OF GILBERTOLUS ALATUS (STEINDACHNER) 
la. Pores in lateral line 58 to 59; pectoral rays usually i, 17; black caudal spot 
barely extending on base of middle rays of caudal fin (Magdalena Basin) 
Gilbertolus alatus alatus (Steindachner) 
1b. Pores in lateral line 63 to 68; pectoral rays usually i, 16; the black caudal spot 
extends on base of caudal fin rays as much as on the caudal peduncle 
(Maracaibo Basin)__-._~- Gilbertolus alatus maracaiboensis Schultz 24 
lc. Pores in lateral line 69 to 74; pectoral rays i, 17; the black caudal spot does 
not extend on base of caudal fin rays, and it becomes less distinct in large 
specimens (Atrato Basin)__--_- Gilbertolus alatus atratoensis Schultz 4 
GILBERTOLUS ALATUS MARACAIBOENSIS Schultz 
FIGurRe 38 
Guilbertolus alatus maracaiboensis ScuuutTz, Journ. Washington Acad. Sci., vol. 33, 
p. 273, 1943 (Maracaibo Basin). 
The following specimens were collected by Leonard P. Schultz 
during 1942 in the Maracaibo Basin of Venezuela: 
U.S.N.M. No. 121386, the holotype, a female, 120 mm. in standard length, 
March 11, in a cafio % km. west of Sinamaica, along with four paratypes, 
U.S.N.M. No. 121387, 107 to 126.5 mm., bearing same data. 
Other paratypes: U.S.N.M. No. 121388, an example, 61 mm., collected Febru- — 
ary 24, in the Rfo Socuy, 3 km. above its mouth; U.S.N.M. No. 121389, a specimen 
75 mm., collected March 2, in the Rio Negro below mouth of Rfo Yasa. 
2 Journ. Washington Acad. Sci., vol. 33, p. 275, 1943. 
