134 MB. G. A. BOULENGER ON THE AFBICAW 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 obtusely 

 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|^. YeUowish, uniform or with 

 8 or 9 dark bars. 



Total length 45 millim. 



Lower Congo. 



51. TiLAPIA ACUTICEPS. 



CJiromis acuticeiis, Steind. Yerh. 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, I3 diameter of eye, which is 4 times in length of 

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

 head ; maxillary extending to between nostril and eye ; 4 or 5 

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

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

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

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

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

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

 Caudal peduncle as long as deep. Scales ctenoid, 30 y^ ; lat. 1. ^g-^- 

 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 obhque streaks on 

 the soft anal. 



Total length 85 millim. 



Angola and district of the Victoria Falls. 



*&^ 



52. TiLAPiA LivLNGSTONii, sp. n. (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 3i times in length of head and slightly exceeds inter- 

 orbital width : mouth moderately large, | width 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 bead, 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 1| ; lat 1. 1|^. Brownish 

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



