1899.] SYEIAN FISHES OF THE FAMILY OICHLIDjE. Ill 



emarginate. Caudal peduncle slightly deeper than long. Scales 

 cycloid, 32 ~ • lat. 1. ^J, Greenish black ; a black opercular 

 spot; fins blackish, soft dorsal and caudal with more or less 

 distinct round light spots between the rays. 



Total length 250 millim. 



Pools on the Kibwesi Eiver, British East Africa. 



3. TiLAPIA SHIEANA. 



OreocTiromis shiranus Bouleng. Proc. Zooj. Soc. 1896, p. 916, 

 fig. 



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



Teeth very small, in 5 to 7 very closely-set series in both jaws. 

 Depth of body 2^ to 2f in total length, length of head 3 times. 

 Snout with straight upper profile, 1^ to 1| diameter of eye, which 

 is 4 to 4i times in length of head and If to 2 in interorbital 

 width ; mouth moderate, f to | width of head ; maxillax'y extending 

 to between nostril and eye ; 2 series of scales on the cheek, Gill- 

 rakers shoi't, 15 to 18 on lower part of anterior arch. ' Dorsal 

 XVI-XYII 10-12; last spine longest, ^ length of head or a little 

 less. Ventral reaching vent. Anal IV 9-10; fourth spine 

 longest, as long as and stronger than middle dorsals. Cavidal 

 peduncle not longer than deep. Scales cycloid, 31-32 jg ; lat. 1. 



20-21 

 15-16' 



Total length 210 millim. 

 Upper Shire River, Nyassaland. 



4. Tilapia mossambica. 



Chromis (Tilapia) mossambicus, Peters, Mon. Berl. Ac. 1852, 

 p. 681. 



Chromis niloticus, part., Peters, Arch.^ f . Nat. 1855, p. 267 ; 

 Giinther, Cat. iv. p. 510 (1862) ; Peters, Eeise n. Mossamb. iv. 

 p. 23, pi. iv. fig. 4 (1868). 



Chromis mossambicus, part., Giinth, 1. c. p. 268. 



Tilapia mossambica, Bouleng. Tr. Zool. Soc. xv. 1888, p. 4. 



Teeth very small, in 4 to 7 series in both jaws. Depth of body 

 2| to 2'^ times in total length, length of head 2| to 3 times. 

 Snout with concave upper profile, 2 to 2| times diameter of eye, 

 which is 5 to 6 times in length of head and 2 to 2^ times in 

 interorbital width ; mouth large, nearly as broad as the head ; 

 maxillary extending to below anterior border of eye or not quite 

 so far ; 2 or 3 series of scales on the cheek, forming a nearly 

 straight or slightly oblique horizontal band, which, under the eye, 

 is at least nearly as broad as the diameter of the eye ; large scales 

 on the opercle. Gill-rakers short, 17 to 20 on lower part of 

 anterior arch. Dorsal XV-XVI 10-11 ; last spine longest, 5 to f 

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

 long as or a little shorter than the head, extending at least as far 

 as origin of anal. Ventral reaching vent or origin of anal. Anal 



