STAPPERSIA.— XENOTILAPIA. 451 



and eye ; 3 series of scales on the cheek. Gill-rakers short and broad, 

 rounded, 10 or 1] on lower part of anterior arch. Dorsal XIII-XV 13- 

 14; spines feeble, subequal from the sixth or seventh, ^ length of head ; 

 longest soft rays ^ to f length of head. Anal III 13-14; third spine 

 shorter than longest dorsals. Pectoral as long as head, extending beyond 

 vertical of origin of anal. Ventral extending beyond origin of anal. 

 Caudal with deep crescentic notch. Caudal peduncle ]| to If times as 

 long as deep. Scales strongly denticulate, 37-38 |^ ; lateral lines -^ . 

 Yellowish or brownish above, with small brown spots ; a lateral series 

 of larger round dark brown spots, the last at the base of the caudal ; 

 a black opercular spot ; a purplish-brown streak along the upper part 

 .of the dorsal and of the anal, and on each lobe of the caudal. 



Total length 90 millim. 



Lake Tanganyika. — Type in Congo Museum, Tervueren. 



1. One of the ty[)es. Tiilo. Dr. L. Stappers (C). 



23. XENOTILAPIA. 



Bouleng. Tr. Zool. Soc. xv. 1890, p. 92, Proc. Zool. Soc. 1900, p. .",, im.l Poiss. 

 Bass. Congo, p. -l-ll (1901); Pellegr. Mem. Soe. Zool. Franee, xvi. 1904, 



Body elongate ; scales ctenoid ; three lateral lines, the upper 

 complete, the others incomplete. Mouth small, horizontal, very pro- 

 tractile ; teeth very small and conical, in two or three series, the outer 

 in the lower jaw directed forwards and perpendicularly to the others. 

 Maxillary folding under the praeorbital. A large papillose pad on each 

 side of the pharynx, forming a protuberance in front of the upper part 

 of the branchial arches. Dorsal with 13 to 15 spines, anal with 3. 

 Inner rays of ventials the longest. Occipital and ])arietal crests strong, 

 extending to between the orbits. Vertebnie 34-35 (13-1 4-1- 20-22). 



Lake Tanganyika. 



Two species : — 



Depth o£ body 3§ to 4^ times in total length ; 



9 gill-rakers on lower part of anterior 



arch ; A. Ill 11-12 1. X. sima, Blgr., p. 452. 



Depth of body 3^ to 3| times in total length ; 



15-17 gill-rakers ; A. Ill 7-8 .... 2. X or»a/«yw»/.s Blgr., p. 453. 



