TILAPIA. 229 



equals or slightly exceeds interorbital width or least depth of praeorbital ; 

 mouth rather large, f to | width of head, extending to between nostril 

 and eye ; end of maxillary exposed ; teeth small, in 4 or 5 series, 44 to 

 60 in outer series of upper jaw; 3 series of scales on the cheek, width 

 of scaly part less than diameter of eye. Gill-rakers short, 12 or 13 on 

 lower part of anterior arch. Dorsal XV-XVI 8^]0; spines subequal 

 from the sixth or seventh, J tof length of head ; longest soft rays about 

 ^ length of head. Anal III 6-8 ; third spine as long as or a little 

 shorter than longest dorsal. Pectoral | length of head, not reaching 

 vertical of origin of anal. Ventral reaching vent or origin of anal. 

 Caudal rou..ded-subtruncate, or truncate. Caudal peduncle as long as 

 deep or a little longer than deep. Scales cycloid, or a few finely 

 denticulated, 29-33 j^ ; lateral lines |fif|. Olive-brown above, pale 

 yellow beneath ; seven to ten dark cross-bars on the back ; each scale 

 of the back and sides with a central vermilion spot; head spotted and 

 marbled with dark purplish brown ; lower jaw and lower part of oper- 

 cular region bright yellow ; dorsal and caudal fins bright yellow, spotted 

 with dark brown ; pectoral yellow ; branchiostegal membrane, pectoral 

 region, outer edge of ventrals, and anal vermilion-red. Young with 10 

 to 12 very distinct and regular dark bars. 



Total length 195 millim. 



Lake Tanganyika. 



E. Coode Ilore, Esq. (C). 

 ( 'iipt. Leiuaire (('.). 



Dr. AV. A. Cunningtou (C). 

 »> 



Dr. L. Stappers (C). 



63. TILAPIA PERRIERI. 



Pellegr. Bull. Soc. Zool. France, 1909, p. 156, and M^ni. Soc. Zool. France, xxii. 

 1910, p. 295, pi. xiv. fig. 4. 



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

 Head a little more than twice as long as broad, with straight upper 

 profile ; snout a little shorter than eye, which is 3 to 3^ times in length 



16 Bou II/III 



