The Freshwater Fishes of So'idh Africa. 



499 



scales dark at the base ; a dark opercular spot ; soft dorsal with dark 

 streaks enclosing white spots ; caudal with dark spots, more plainly 

 visible on upper lobe. 





wy$&S2Z~-3. 



i T liffiTcrfficttrrSiz^,- 1 ^ 



FIG. 128. Tilapia, swiersirae. Type. 



One specimen, 222 mm. in length, from Thabina River, Transvaal 

 (Mr. C. J. Swierstra). 



14. TlLAPIA MACKEANI, n. Sp. 



Teeth in 4 series, those of the outer row larger ; 60 in outer series 

 on upper jaw. Depth of body 2^ times in total length excluding 

 caudal, length of head 3-| times. Head with elevated and rounded 

 profile, li times as long as broad; snout with slightly concave upper 

 profile, as long as broad and equal to postocular portion of head ; eye 

 4f times in length of head, interorbital width, f least depth of 

 preorbital ; mouth f width of head, extending to between nostril and 

 eye; four to five series of scales on the cheek, width of scaly part 1A 

 times diameter of eye. Gill-rakers, 9 on lower part of anterior arch. 



Dorsal xvi 12 ; spines increasing in length to the last, which is nearly 

 | length of head ; longest soft rays -^ length of head. Pectoral 1|- 

 times length of head, reaching to vent. Ventral not reaching vent. 

 Anal iii 10 ; 3rd spine a little more than |. length of head. Caudal 



