new African Cichlid Fishes. 139 



of anterior arcli. Dorsal XVI-XVII 11-13; spines sub- 

 equal from tlie fifth or sixth, f to not quite | length of head ; 

 longest soft rays i to § length of head. Anal III 9-10; 

 third spine longer than longest dorsal, ^ or a little more than 

 ^ length of head. Pectoral 1 to 1/, times as long as head, 

 reaching beyond vertical of origin of anal. Ventral reaching 

 vent or origin of anal. Caudal truncate. Caudal peduncle 

 as long as deep. Scales 31-32 g^ ; lateral lines ;|^g. Dark 

 brown above, with or without very indistinct darker cross- 

 bars, yellowish beneath ; a black opercular spot ; fins brown 

 or blackish, uniform or with oblique streaks on the soft dorsal. 



Total length 180 mm. 



Several specimens from the south-eastern slope of 

 Mr. Ruwenzori, altitude 3200 feet, collected by Mr. R. B. 

 Woosnam on tlie Ruwenzori Expedition. I had first referred 

 this fish to Tilapia nilotica, from which it differs in the longer 

 caudal peduncle, the truncate caudal fin, and the longer anal 

 spines. 



Tilapia macrochir. 



Depth of body If to 2^ times in total length, length of 

 head 3 times. Head If to 1^ times as long as broad ; upper 

 profile descending in a strong curve, often very abrupt in 

 front ; snout rounded, sometimes with concave upper profile, 

 a little broader than long, shorter than postocular part of 

 head ; eye 4 to b^ times in length of head, | to ^ inter- 

 orbital width, equal to or a little less than praeorbital depth ; 

 mouth rather small, ^ to ? width of head, extending to be- 

 tween nostril and eye ; teeth in 5 to 8 series, 70 to 100 in 

 outer series of upper jaw ; 2 or 3 series of scales on the 

 cheek, widtli of scaly part not greater than diameter of eye. 

 Gill-rakers moderate, 21 to 25 on lower part of anterior arch. 

 Dorsal XVI (rarely XV) 12-13 ; last spine longest, ^ to § 

 length of head ; longest soft ray | to 1 length of head. 

 Anal III 9-10 ; third spine ^ to ^ length of head. Pectoral 

 1^ to 1^ (1^ in young) length of head, reaching beyond 

 vertical of origin of anal. Ventral reaching vent or anal. 

 Caudal truncate or slightly emarginate. Caudal peduncle 

 deeper than long. Scales cycloid, 29-31^.: lateral lines 

 ^^. Olive-brown above, golden-yellow beneath, sometimes 

 with rather indistinct darker longitudinal streaks following 

 the series of scales ; a blackish opercular spot ; head and 

 anterior part of body usually with small brown or blackish 

 spots ; young with 7 to 10 narrower vertical dark bars ; 



