OF PISHES FROM LAKES TANGAjSTTIKA AND KIVU. 157 



38. TiLAPIA >'ILOTICA L. 



This Nile species, which is also found in Syria, in the Senegal, Gambia, and Niger, 

 has been found in Lake Kivu. 



o9. TiLAPIA BUETONI Gthr. 



Discovered at Ujiji by Mr. Coode Hore, this species has since been found at Albert- 

 ville by Capt. Hecq. Mr. Moore obtained specimens in Lake Kivu. 



40. TiLAPIA DAKDENNII Blgr. 



Kibwesi and Kalambo. Grows to a length of 230 millim. 



41. TiLAPIA LABIATA Blgr. 



Kibwesi. 



42. TiLAPIA PLEUROT^NIA. (Plate XVIII. fig. 4.) 

 Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 4. 



Depth of body 2^ to 3 times in total length, length of head 3 to 3^ times. Snout 

 with the profile descending in a straight line, as long as the diameter of the eye, which 

 is contained ^ to 31 times in length of head, and exceeds a little interocular width ; 

 mouth small, its width half, or a little more than half, that of the head, extending to 

 below nostril or between nostril and eye ; teeth very small, in 3 series, outer bicuspid ; 

 3 or 4 series of scales on the cheek. Gill-rakers short, 10 to 12 on lower part of 

 anterior arch. Dorsal XV-XVIII 11-12 ; last spine longest, a little less than half 

 length of head ; longest soft rays f length of head. Pectoral pointed, a little shorter 

 than the head, not quite reaching origin of anal. Anal III 8-10 ; third spine a little 

 shorter than last dorsal spine. Caudal deeply notched, crescentic. Caudal peduncle 



-24 



li as long as deep. Scales very thin, without denticulation, 32-35 jj^ ; lat. 1. ^-q:^. 

 Pale brown above, white beneath ; a blackish lateral stripe, from the opercle to the 

 caudal ; fins greyish ; small, round, white spots on soft dorsal and caudal. 



Total length 110 millim. 



Several specimens from the north end of Lake Tanganyika and from the mouth of 

 the Rusisi River. 



43. TiLAPIA TREMATOCEPHALA. (Plate XIX. fig. 6.) 

 Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 4. 



Depth of body equal to length of head, 3^ times in total length. Snout with slightly 

 convex upper profile, a little shorter than diameter of eye, which is contained 3 times 

 in length of head and exceeds interocular width ; mouth small, its width half that of 

 head, extending to between nostril and eye ; teeth very small, in 2 rows, outer bicuspid ; 

 3 series of scales on the cheek ; large scales on the opercle ; orifices of sensory canals 



