TILAPIA. 



517 



half of caudal bright yellow, the former usually with one, two, or three orange ocellar 

 spots encircled with red ; ventral fins black or blackish ; iris white. 



Lake Victoria. Thirty-five specimens were obtained b) Mr. Degen at Entebbe 

 (6.05), Bunjako (5-14.11.05), and Buganga (15-28.11.05). 



3. TILAPIA NUBILA. 



(Plate XCI. fig. 4.) 



Boulenger, Ann. & Mag. N. H. (7) xvii. 1906, p. 450. 



Depth of body equal to the length of the head, twice and three-fifths to three times 

 in the total length. Profile of the snout straight or convex ; diameter of the eye 

 equal to the length of the snout (a little greater in the young) and to the interorbitai 

 width, once and a half to once and two-thirds the least width of the prseorbital, three 

 to three and a half times in the length of the head ; mouth not very oblique, with 

 thick lips, extending to below the anterior border of the eye or not quite so far ; teeth 

 in three or four series in both jaws, outer largest and numbering 40 to 60 in the upper 

 jaw; three or four series of scales on the cheek, the depth of the scaly part nearly 

 equal to the diameter of the eye (less in the young) ; large scales on the opercle. 



Measurements (in millimetres). 



Total length 



„ „ (without caudal) . . 



Greatest depth of body 



Length o£ head 



Width of head 



Length of snout 



Diameter of eye 



Interorbitai width 



Length of last dorsal spine .... 

 ,, longest soft dorsal ray 

 ,, third anal spine .... 

 „ longest soft anal ray 

 „ pectoral 



120 

 100 



36 



33 



16 



H 



n 



15 



26 

 14 



28 

 28 



100 

 85 

 30 

 30 

 II 

 8| 



H 



H 



15 

 25 



13 

 23 



2Q 



85 

 68 

 25 

 25 



12 



7 



13 

 15 

 12 

 II 



90 



70 



58 



20 



20 



9 



5 



6 



6 



9 



12 



9 



12 



16 



