310 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
MARCUSENIUS BRACHYISTIUS Gill 
Marcusenius brachyistius Girt, Proc. Acad. Nat. Sci, Philadelphia, p. 189, 1862 
(Liberia). 
Marcusenius brachistius BouLeNcER, Cat. fresh-water fishes Africa, vol. 1, p. 67, 
1909 (Liberia); vol. 4, p. 158, 1916 (Nanna Kru, Liberia).—NicHots and 
LAMontp, Amer. Mus. Nov. No. 626, p. 2, 19383 (Kaleata, Liberia). 
Mormyrus liberiensis STEINDACHNER, Notes Leyden Mus. vol. 16, p. 67, 1894 (Suly- 
mah and Junk Rivers; Fischermann See). 
The following specimens are in the National Museum collections: 
U.S.N.M. No. 4098 (type of Marcusenius brachyistius Gill), Liberia. 
U.S.N.M. No. 118782, 13 specimens, 56 to 113 mm., Bromley, W. M. Mann. 
U.S.N.M. No. 118783, 30 specimens, 48 to 185 mm., Bendaja, W. M. Mann. 
U.S.N.M. No. 118784, 58 specimens, 42 to 1385 mm., Harbel, W. M. Mann. 
U.S.N.M. No. 118785, 17 specimens, 52 to 115 mm., Gibi Mountain, W. M. Mann. 
Genus GNATHONEMUS Gill 
Gnathonemus Git, Proe. Acad. Nat. Sci. Philadelphia, 1862, p. 444. (Type: 
Mormyrus petersi Giinther. ) 
GNATHONEMUS MENTO (Boulenger) 
Mormyrus mento BouLencer, Ann. Mag. Nat. Hist., ser. 6, vol. 6, p. 193, 1890. 
Gnathonemus mento STEINDACHNER, Notes Leyden Mus., vol. 16, p. 72, 1894 
(Sulymah River).—BovLenceErR, Cat. fresh-water fishes Africa, vol. 1, p. 106, 
fig. 86, 1909 (Liberia)—PELiecrIN, Poiss. eaux douces Afr, Occid., p. 63, 
1923 (Liberia). 
GNATHONEMUS USSHERI (Giinther) 
Mormyrus ussheri GiinrHEeR, Ann. Mag. Nat. Hist., ser. 8, vol. 20, p. 116, 1867— 
STEINDACHNER, Notes Leyden Mus., vel. 16, p. 71, 1894 (Duqueah River). 
Gnathonemus ussheri BouLENGER, Cat. fresh-water fishes Africa, vol. 1, p. 116, 
fig. 95, 1909 (Liberia)—Prtiecrin, Poiss. eaux douces Afr. Occid, p. 67, 
1923 (Liberia). 
Family MASTACEMBELIDAE 
Genus MASTACEMBELUS Scopoli 
Mastacembelus Scoroit, Introduce. hist. nat. Prague, p. 458, 1777. 
MASTACEMBELUS LIBERIENSIS Boulenger 
Mastacembelus marchei (not Sauvage) STeErNDACHNER, Notes Leyden Mus., vol. 16, 
p. 31, 1894 (Fischermann See, Liberia). 
Mastacembelus libericnsis BouLencer, Trans. Zool. Soe., vol. 15, p. 238, 1898 
(Liberia), 
The specimens before me do not agree exactly with Boulenger’s or 
Steindachner’s descriptions so I am adding the following supple- 
mental observations: Margin of dorsal, caudal, and anal pale, color 
pattern reticulated, the pale circular areas small anteriorly and most 
distinct ventrally on sides, the belly being pale, the pale circular areas 
large posteriorly so only two rows occur on tail region, these extended 
