134 ME. G. A. BOULBNGER ON 'JCHE AFRICAN AND [Feb. 7, 



spines equal in length from the fourth or fifth; soft rays produced, 

 the longest twice as long as the longest spines. Pectoral obtusel}'' 

 pointed, | to | length of head, not extending to origin of anal. Ven- 

 tral reaching origin of anal. Anal III 6-7 ; third spine as long as 

 longest dorsal. Caudal rounded. Caudal peduncle as long as deep. 

 Scales ctenoid, 29-30 '— ; lat. 1. j^^. Yellowish, uuiform or with 

 8 or 9 dark bars. 



Total length 45 millim. 



Lower Congo. 



51. TiLAPIA ACUTICEPS. 



Chromis acuticeps, Steind. Verh. zool.-bot, Ges. Wien, xvi. 1866, 

 p. 764. 



Teeth very small, in 2 series. Depth of body a little less than 

 length of head, about 3 times in total length. Snout with straight 

 upper profile, Ig diameter of eye, which is 4 times in length of 

 head and equals interorbital width ; mouth moderate, § width of 

 head ; maxillarj'- extending to between nostril and eye ; 4 or 5 

 series of scales ou the cheek ,; large scales on the opercle. Gill- 

 rakers short, 9 on lower part of anterior arch. Dorsal XIY-XV 

 10-11 ; last spine longest, about | length of head and | longest 

 soft rays. Pectoral obtusely pointed, about |- length of head, not 

 extending to origin of anal. Ventral reaching rent. Anal III 

 8-9 ; third spine nearly as long as last dorsal. Caudal rounded. 

 Caudal peduncle as long as deep. Scales ctenoid, 30 j^ ; lat.l. — f^- 

 Yellowish brown, with several dark bars ; a black opercular spot ; 

 a dark streak from below the eye to the angle of the mouth ; 

 vertical fins with small blackish spots, forming oblique streaks on 

 the soft anal. ■ ; 



Total length 85 millim. 



Angola and district of the Victoria Palls. 



52. TiLAPiA LiviNGSTONii, sp. u. (Plate XI. fig. 2.) 



Teeth in 6 series in both jaws, outer moderately large and bi- 

 cuspid, inner very small, closely-set, and tricuspid. Depth of body 

 scarcely greater than length of head, 3 times in total length ; snout 

 descending in a strong curve, as long as the eye, the diameter of 

 which is 3| times in length of head and slightly exceeds inter- 

 orbital width ; mouth moderately large, | widtlb of head, extending 

 to below anterior border of eye ; 3 or 4 series of scales on the 

 cheek ; larger scales on the opercle. Gill-rakers short, 8 on lower 

 part of anterior arch. Dorsal XVII 9 ; last spine longest, not 

 quite I length of head, | longest soft rays. Pectoral pointed, 

 I length of head, not extending to origin of anal. Ventral reaching 

 origin of anal. Anal III 8 ; third spine a little shorter than last 

 dorsal. Caudal rounded. Caudal peduncle as long as deep. 

 Scales with strongly denticulate edge, 33 ^ ; lat 1. jj^. Brownish 

 above, with 7 dark bars, the first on the nape, the penultimate ou 



