TILAPIA. 251 



10 or 11 on lower part of anterior arch. Dorsal X1V-XV 10-11 ; last 

 spine longest, f to | length of head, about f longest soft rays. Anal 

 III 8-9 ; third spine a little shorter than longest dorsal. Pectoral 

 as long as head, reaching vertical of origin of anal. Ventral reaching 

 vent or anal. Caudal slightly notched, pointed above, rounded below. 

 Caudal peduncle If to H times as long as deep. Scales distinctly 

 denticulate, 31-32 jtj ; lateral lines ^|. Brownish above, white below, 

 with or without 8 or 9 more or less distinct dark bars ; four round 

 blackish spots on each side, the first on the operculum, the fourth at the 

 base of the caudal fin ; a dark bar below the anterior border of the eye ; 

 fins brown, spinous dorsal edged with darker; regular series of ocellar 

 spots between the dorsal rays ; caudal with small pale spots. 



Total length 110 millim. 



Lake Nyassa. 



1-4. Types. L. Nyassa. Sir H. H. Johnston (P.). 



5-14. Types. Zomba. „ 



15. Yg. Fort Johnston. „ 



16-17. Hgr. & yg. Between Kondovve and A. Whyte, Esq. (('.) ; 



Karanga. Sir H. H. Johnston (P.). 



82. TILAPIA KIRKII. 



Chromis kirkii, Giinth. Proe. Zool. Soc. 1893, p. 624. pi. hi. fig. A. 



Ctenochromis kirkii, Pfeff. Thierw. O.-AI'r., Fische, p. 19 (1896). 



Tilapia kirkii, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4, and Proc. Zool. Soc. 1899, 



p. 128. 

 Tilapia strigigena, part., Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 336. 



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

 times. Head a little over twice as long as broad ; snout rounded, with 

 straight upper profile, as long as broad, as long as postocular part of 

 head ; eye 3^ to 4 times in length of head, equal to or a little less than 

 interorbital width, equal to or a little greater than least prseorbital 

 depth; mouth rather small, f to § width of head, extending to below 

 nostril or between nostril and eye ; teeth moderate, in 3 or 4 series, 

 30 to 60 in outer series of upper jaw ; 3 series of scales on the cheek, 

 width of scaly part -| to f diameter of eye. Gill-rakers short, 11 or 12 

 on lower part of anterior arch. Dorsal XV-XVII 9-11 ; spines increas- 

 ing in length to the last, which measures about ^ length of head ; soft 

 rays not or but little longer. Anal III 8-10 ; third spine a little 



