FRESH-WATER FISHES OF LIBERIA—-SCHULTZ S27 
2b. Anal rays usually fewer than 62. 
3a. Dorsal rays 55; anal 50 (see table 3)___Clarias biittikoferi Steindachner 
3b. Dorsal rays 70 to 82 (74 in a specimen from Liberia) ; anal rays 52 to 
63 (52 in a Liberian specimen) ; dorsal and anal fins not joined to 
caudal and with but little or no space between them; depth 6 or 7 in 
total length; maxillary barbel reaching past pectoral sometimes to 
pelvics ; nasal barbel as long as head (after Boulenger). 
Clarias angolensis Steindachner 
8c. Dorsal rays 60 to 68 (64 to 66 in counts made on Liberian material) ; 
anal 48 to 55 (in Liberian material) ; depth 514 to 6 in standard length 
and 64 to 6%4 in total length; dorsal and anal not joined to caudal fin 
but with no free space between them; maxillary barbel reaches to near 
end of pectoral fin; nasal barbel reaches to rear of base of pectoral fin. 
Clarias liberiensis Steindachner 
1b. First dorsal fin if present very short, composed of but a few rays, or the dorsal 
fin is divided into two parts, the posterior adipose. 
4a. A rayed dorsal fin absent, but an adipose fin present; anal short with 3 
simple rays and 6 to 10 branched rays; gill membranes widely joined to 
the isthmus; adipose fin far back over the anal; pectoral, without spines, 
but with about 9 soft rays, the first simple, others branched; under the 
skin all over the body is an electric gland, whitish and jellylike; body and 
head blotched with blackish; a pale bar across caudal peduncle; central 
part of caudal fin blackish, the margin white. . 
Malapterurus electricus (Gmelin) 
4b. A rayed dorsal fin and an adipose fin both present, these two fins separate ; 
no electric gland under the skin; gill membranes free from isthmus, 
deeply notched. 
5a. Dorsal fin is short, with a spine and 5 or 6 branched rays and a very small 
adipose fin, its base not longer than the base of two dorsal fin rays ; body 
strongly compressed; the anal fin very long; caudal fin forked; eye 
with free border ; pectoral with a spine. 
6a. Maxillary barbel longer than outer mandibulary barbel; anal rays 54 
to 60; pectoral spine strongly serrated on inner side; nasal barbel 
not longer than eye; depth 3 to 424 in total length and head 5 or 6; 
a blackish obscure blotch on side above the pectoral fin (after 
Boulenger)) 02) ites, eee ee ree Eutropius niloticus (Riippell) 
6b. Maxillary barbel longer than outer mandibulary barbel; anal rays 46 
to 50; pectoral spine moderately serrated on inner side; nasal barbel 
not longer than eye; depth 4 to 424 and head 5 times in total 
length; a blackish blotch above pectoral fin. 
Eutropius liberiensis Hubrecht 
6c. Maxillary barbel not longer than outer mandibular barbel; anal rays 
52 to 59; maxillary and nasal barbels of about same length, the 
nasal barbel a little longer than eye; depth 334 to 414 and head 
5 to 514 in total length; inner edge of pectoral spine strongly serrated. 
Eutropius mandibularis Giinther 
5b. Rayed or first dorsal fin base short, the length of the base of the adipose 
fin is longer than the length of the base of two dorsal rays. 
7a. Length of base of adipose dorsal fin about same length as diameter of 
the eye; dorsal rays about I, 6; anal with 5 or 6 simple rays and 8 or 
9 branched rays; nasal barbel present but short; maxillary barbel 
reaches a little past front base of pectoral; a small patch of teeth 
on head of palatines. 
