The Freshwater Fishes of South Africa. 



501 



excluding caudal, length of head 3-^ times. Head l Y 7 a times as long 

 as broad, upper profile descending in a hold curve ; snout with concave 

 upper profile, l times as long as broad, 1^ times as long as postocular 

 part of head ; eye 4f times in length of head, a little more than | 

 interorbital width, nearly f least depth of preorbital ; mouth ^ width 

 of head, reaching to below nostril ; scales on cheek in 3 rows, width of 

 scaly part 1^ times diameter of eye. Grill-rakers short, anvil-shaped, 

 9 on lower part of anterior arch. 



Dorsal xvi 11; last spine longest, -| length of head; soft rays f 

 length of head. Pectoral a little longer than head, scarcely reaching 

 vertical of origin of anal. Ventral not reaching vent. Anal iii 8 ; 

 3rd spine i length of head. Caudal truncate, slightly emarginate ; 

 caudal peduncle 1| times as deep as long. Scales cycloid, 28^ ; 

 lateral lines ff. 



Colour (of preserved specimen) dark brown above, whitish beneath, 

 scales dark at base ; a dark opercular spot ; dorsal with dark spots or 

 streaks forming longitudinal lines ; caudal with dark spots on upper 

 lobe. 



One specimen, 245 mm. Jin length, from Kafue River, Rhodesia 

 (Mr. J. Drury). 



17. TlLAPIA RUMSAYI, n. sp. 



Teeth in 3 rows, an outer series of large teeth followed by 2 inner 

 rows of minute ones. Depth of body 3f times in total length exclud- 

 ing caudal, length of head 2t- times. Head 2^ times as long as broad ; 



FIG. 129. Tilapia rumsayi. 



snout with straight upper profile, IT times as long as broad, a little less 

 than postocular part of head ; eye 3^ times in length of head: 1| times 

 interorbital width, If times least depth of preorbital; mouth a little 

 more than ^ width of head, extending to between nostril and eye, lower 

 jaw slightly projecting beyond upper ; scales on cheek in 4 rows, width 



