130 MB. G. A, BOULENGEE ON THE AFEICAN AWD [Feb. 7, 



the spots having a tendency to form oblique stripes on the soft 

 dorsal. 



Total length 180 millim. 



Lake Nyassa. 



43. TiLAPIA JOHNSTONI. 



Chromis subocularis, part., Giinth. Proc. Zool. Soc. 1893, p. 621, 

 pi. liv. fig. B. 



Chromis johnstoni, Giinth. I.e. p. 622, fig. A. 



Chromis tetrastigma, Giinth. 1. c. p. 623, fig. C. 



Tilapia suhoculains, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. 



Tilapia johnstoni, Bouleng. I. c. 



Tilapia tetrastigma, Bouleng. 1. c. 



Teeth in 4 or 5 series, the outer moderately large and separated 

 by a considerable interspace from the others, which are very minute 

 and conical. Depth of body nearly equal to length of head, 2| to 

 3 times in total length. Snout ^vith straight upper profile, Ig to 

 1| diameter of eye, \Ybich is 3| to 4 times in length of head and 

 equal to or some\^hat greater than interorbital width ; mouth f 

 width of head ; maxillary extending to between nostril and eye ; 

 3 or 4 series of scales on the cheek ; large scales on the opercle. 

 Gill-rakers short, mostly notched, 11 or 12 on lower jjart of 

 anterior arch. Dorsal XIV-XVI 10-11 ; last spine longest, f to 

 ^ length of head, | longest soft rays. Pectoral pointed, as long 

 as or a little shorter than the head, extending to origin of anal. 

 Ventral reaching vent or anal. Anal III 8-9 ; third spine a little 

 shorter than longest dorsal. Caudal slightly notched, pointed 

 above, rounded below. Caudal peduncle 1^ to 1| as long as deep. 



Scales finely denticulate on the border, 32-33 .^r-i; : lat. 1. |?^f' 



' 11-13 • 14-lb 



Pale olive, with 6 to 8 more or less regular dark bars, which may 

 be accompanied or replaced by a few blackish spots ; a dark 

 opercular spot ; dorsal with oblique dark streaks and rows of 

 small pale spots ; caudal with small pale spots. 



Total length 115 millim. 



Lake Nyassa and Upper Shire Biver. 



44. Tilapia pectoealis. 



Ctenochromis pectoralis, Pfeffer, Jahrb. Hamb. wiss. Anst. x. 

 1893, p. 153, pi. ii. figs. 3, 4, 7, and Thierw. O.-Afr., Fische, p. 16, 

 fig. (1896). 



Teeth in 5 rows in both jaws, inner very minute. Depth of 

 body nearly equal to length of head, 24 times in total length. 

 Snout with straight upper profile, as long as the eye, the diameter 

 of which is contained somewhat more than 3 times in length of 

 head and a little exceeds interorbital width ; mouth extending 

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

 cheek ; larger scales on the opercle. Gill-rakers very short, 10 on 

 lower part of anterior arch. Dorsal XV-XVI 8-9 ; soft rays 

 somewhat produced. Pectoral pointed, nearly as long as head, 



