Fishes from Lake Xyassa. 243 



1^ to 1^ times as long as deep. Scales finely denticulate. 

 Brownish above, silvery white beneath, uniform or with very 

 indistinct numerous darker vertical bars ; spinous dorsal with 

 a dark and lio-lit edsre. 



Total leng'th 80 mm. Six specimens. 



Allied to T.johnsfonii, Gthr. 



Tilapia hrevis. 

 D. XV 12. A. Ill 9. Sc. 31-32 ~. L. 1. fgf. 



Deptii of body 2^ times in total lengthy length of head 2| 

 times. Eye 2\ times in length of head ; snout with very 

 convex upper outline, § diameter of eye; maxillary extending 

 to below anterior border of eye ; lower jaw not projecting ; 

 teeth very small, in 2 or 3 series ; 3 series of scales on the 

 cheek; 8 gill-rakers on lower part of anterior arch. Dorsal 

 spines increasing in length to the last, which measures about 

 ^ length of head. Pectoral as long as head. Caudal fin with 

 crescentic emarginatiou. Caudal peduncle as long as deep. 

 Scales finely denticulate. Silvery, back brownish ; a dark 

 brown band on each side, from the uape to the root of the 

 tail ; a dark brown opercular spot. 



Total length 70 mm. Two specimens. 



Allied to T. johnstonii, Gthr. 



Chilotilapia, gen. nov. 



Teeth in several rows, with obtuse or rounded crowns ; 

 maxillary exposed ; lips thick. 3 anal spines. 



Chilotilapia rhoadesii. 

 D. XV 10. A. Ill 9. Sc. 34 ^3. L. 1. JJ. 



Depth of body 2J times in total length, length of head 3 

 times. Snout short, upper profile descending abruptly ; eye 

 4^ times in length of head ; maxillary extending to below 

 nostril and eye; teeth in 5 irregular series, outer largest; 4 

 series of scales on the cheek; 11 gill-rakers on lower part of 

 anterior arch. Dorsal spines increasing in length to the last, 

 which is a little loss than I length of head. Pectoral as long- 

 as head. Caudal fin densely scaled, feebly emarginate. 

 Caudal peduncle 1^ times as long as deep. Scales finely 

 denticulate. Dark blue ; dorsal and anal fins broadly edged 

 with orange. 



Total length 220 mm. A single specimen. 



17* 



