TILAPIA. 



263 



91. TILAPIA INORNATA. 

 Bouleng. Ann. & Mag. N. H. (8) ii. 1908, p. 242. 



Depth of body equal to length of head, 3^ to 3$ times in total 

 length. Head a little over twice as long as broad ; snout rounded, with 

 straight or slightly convex upper profile, as long as broad, as long as 

 postocular part of head ; eye 2f to 3 times in length of head, exceeding 

 interorbital width, nearly twice as long as least praeorbital depth; mouth 

 small, J to | width of head, extending to between nostril and eye ; teeth 

 very small, in 3 series, about 50 in outer series of upper jaw ; 2 or 3 

 series of scales on the cheek, width of scaly part not half diameter of 

 eye. Gill-rakers moderately long, 15 or 16 on lower part of anterior 



Fijr. 1 73. 



Tilajna uiorwtta. 



Tyre- 



arch. Dorsal XVI-XVII 11-12 ; spines increasing in length to the 

 last, which measures a little less than \ length of head ; longest soft 

 rays not longer. Anal III 9 ; third spine a little more than £ length of 

 head. Pectoral as long as head, not reaching origin of anal. Ventral 

 barely reaching vent. Caudal with crescentic emargination. Caudal pe- 

 duncle 1§ times as long as deep. Scales finely denticulate, 34-36 xjrr^; 

 lateral lines j^jg. Silvery, back olive ; a dark opercular spot. 

 Total length 95 millim. 



Lake Nvassa. 



1-2. Types. 



L. Nvassa. 



Capt. E. L. Rhoades (P.). 



