new Fishes from Lakes Tanganyika and Kivu. 4) 
Tilapia boops. 
D. XU-XIU1 14. A. IIT 8-9. Sq. 39-40 2. 
L, lat. 84-35/15-19. 
Depth of body equal to length of head, 34 to 34 times in 
total length. Diameter of eye 23 in length of head; mouth 
not extending quite to below anterior border of eye; 3 series 
of teeth; 2 or 3 series of scales on the cheek. 13 gill-rakers 
on lower part of anterior arch. Pectoral as long as head. 
Caudal deeply notched. 
Total length 90 millim. 
Two specimens from Msambu, Tanganyika. 
ASPROTILAPIA, gen. nov. 
Teeth small, tricuspid, closely set, in two series. Mouth 
inferior, transverse. Body elongate, much attenuate in the 
caudal region. Scales ctenoid; two lateral lines. Anal 
with 3 spines. 
Allied to Tilapia. 
Asprotilapia leptura. 
D. XIV 12, A.TII8. Sq. 384. L. lat. 27/20. 
Body rather feebly compressed, its depth 5 times in total 
length. Snout subconical, projecting strongly beyond the 
mouth ; diameter of eye 22 times in length ot head; 3 series 
of scales on the cheek. Caudal deeply notched. Caudal 
peduncle 3 times as long as deep. 
Total length 95 millim. 
A single specimen from Msambu, Tanganyika. 
Mastacembelus frenatus. 
D. XVITSs. AE 90: 
Vent equally distant from the end of the snout anid from 
the caudal ; length of head 33 times in its distance from vent. 
Mouth extending to below anterior border of eye; no pre- 
opercular spines. Body with dark brown marblings; a dark 
streak on each side of the head, passing through the eye ; 
two brown bars across the caudal. 
Total length 250 millim. 
A single specimen from the north end of Lake Tanganyika. 
