TILAPIA. 



211 



part of head ; eye 3§ (young) to 4 times in length of head, greater than 

 prseorbital depth ; month large, f width of head, extending to below 

 anterior border of eye ; lips very strongly developed ; teeth moderately 

 slender, in 3 or 4 series, 40 to 50 in outer series of upper jaw ; 2 series 

 of scales on the cheek, width of scaly part rather less than diameter of 

 eye. Gill-rakers short, 13 or 14 on lower part of anterior arch. 

 Dorsal X1II-XV 11 ; spines increasing in length to the last, which 

 measures f length of head ; longest soft rays f length of head. Anal III 

 (exceptionally IV) 9-10 ; third spine - s length of head. Pectoral about 

 f length of head, usually not reaching origin of anal. Ventral reaching 

 vent or anal. Caudal rounded, subtruncate. Caudal peduncle deeper 



Dark brown. 



12 



lateral lines 



than long. Scales cycloid, 30-31 



with black vertical bars on the body, or entirely black. 



Total length 75 millim. 



Eusso Nyiro, East of Lake Baringo. 



1-8. Types. Hot springs at Chandler Fulls, 



N. Eusso Nyiro, 2500 ft. 

 9. Skel. 



1- 20 

 13- n;- 



A. Blavney Percival, Esq. 

 (P.). 



45. TILAPIA GRAHAMI. 

 Bouleng. Ann. & Mag. N. H. (8) ix. 1912, p. 519. 



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

 times. Head large, \\ to 1| times as long as broad; suout rounded. 



Fur. 136. 





Tilapia grahami. 

 Type. 



with convex upper profile, much broader than long, f to f pcstocular 

 part of head ; eye 3 J to 4| times in length of head, a little greater than 

 praeorbital depth ; mouth large, f width of head, extending to between 

 vertical of nostril and anterior border of eye ; lips very strongly 

 developed, the lower forming a very distinct lobe on each side ; teeth 



