The Freshwater Fishes of South Africa. 531 



Caudal rounded-subtruncate ; caudal peduncle as long as deep. 

 Scales cycloid, 30 T % ; lateral lines f | . 



Colour (of preserved specimen), dark olive brown above, lighter 

 beneath, with a dark bar at the base of the scales ; dorsal edged with 

 whitish, the soft portion of fin with regular series of immd or oval 

 dark spots ; anal with similar spots lighter in shade ; ventrals blackish. 



One specimen, 119 mm. in length, from Lake Ngami (H. F. 

 Kirkham). 



10. PAETATILAPIA MARGINATA, n. sp. 



Teeth, an outer row of short conical teeeth, about 40 to 60 on upper 

 jaw, followed by 2 or 3 series of minute teeth on anterior part of jaws. 

 Depth of body 2 to 2-| times in total length excluding caudal, length 

 of head 24 to neai'ly 3 times. Head li times to nearly twice as long 

 as broad, upper profile curved, with a depression before the eye ; snout 

 with straight or slightly convex upper profile, a little longer than 

 broad, about length of postocular part of head ; eye 4^ times in 

 length of head, interorbital width, a little greater than preorbital 

 depth ; mouth f width of head, reaching to between nostril and eye ; 

 4 to 5 series of scales on cheek, depth of scaly part 1^ to 1^ times 

 diameter of eye. Gill-rakers short, thick, 11 to 12 on lower part of 

 anterior arch. 



Dorsal xvi 13 ; spines increasing in length to the last, which is nearly 

 ~ length of head ; longest soft rays f to f length of head. Pectoral a 

 little more than T 7 ^ length of head, reaching to vent. Ventral as long 

 as pectoral, reaching to or slightly beyond vent. Anal iii 9-10, 3rd 

 spine a little shorter than longest dorsal spine. Caudal truncate, 

 feebly emargiuate and with slightly rounded corners ; caudal peduncle 



ly\y as deep as long. Scales cycloid, 83-36 ^; lateral lines ^|^. 



Colour (of preserved specimen) olive green, dark above, light 

 beneath, scales with a light marginal band ; a dark opercular spot ; 

 spinous dorsal edged with yellowish, soft dorsal with dark and a few 

 light spots and with the outer half of the fin yellowish ; anal with a 

 few indistinct light spots and with a broad yellowish margin ; outer 

 half of caudal yellowish ; veiitrals dark, tipped with yellowish ; pectoral 

 pale yellowish. 



One specimen, 95 mm. in length, from Lialui, Upper Zambesi (Rev. 

 Ellenberger). 



One specimen, 232 mm. in length, from Bulawayo Museum. 



