TILAPIA. 211 



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

 prrcorbital depth ; month large, | Avidth 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 XIII-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 ^ length of head. Pectoral about 

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

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

 than long. Scales cycloid, 30-31 ^f ; lateral lines j^. Dark brown, 

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



I'otal length 75 millim, 



Eusso Nyiro, East of Lake Baringo. 



1-8. Types. Hot springs at Chandler Falls, A. Blayney Percival, Esq. 



N. Eusso Nyiro, 2500 ft. (P.). 



9. Skel. „ „ „ 



45. TILAPIA GRAHAML 

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



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

 times. Head large, J | to If times as long as broad; snout rounded, 



ri<i. 130. 



TUapia graJiami, 

 Type. 



with convex upper profile, much broader than long, 3 to f postocular 

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

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

 vertical of nostril and anterior border of eye ; lii)S very strongly 

 developed, the loAver forming a very distinct lobe on each side ; teetli 



