SIMOCHKOMIS. 



275 



and transverse when closed ; maxillary concealed under the prseorbital. 

 Dorsal with 17-19 spines, anal with 3. Vertebras 32 (15 + 17). 



Intermediate between Tilapia and Tropheus. As pointed out by 

 Tellegrin, this genus is connected with Tilapia through T. williamsii. 



1. SIMOCHROMIS DIAGRAMMA. 



Chromis diagramma, Giinth. Proc. Zool. Soc. 1893, p. 632, pi. lviii. fig. 3. 

 Simochromis diagramma, Bouleng. Tr. Zool. Soc. xv. 1898, p. 19, and Poiss. Bass. 



Congo, p. 451 (1901) ; Pellegr. Mem. Soc. Zool. France, xvi. 1901, p. 307 ; 



Bonleng. Tr. Zool. Soc. xvii. 1906, p. 571. 



Depth of body 2\ to 3 times in total length, length of head 3^ to Sh 



Fig. 187. 



SSfe^g 



w? 





'/' : W.. 



■;■,■ ... . • ■ '^^ \\ 



»': • 







< 



Simochromis diagramma. 

 Pembe. |. 



times. Head massive, rounded, not twice as long as broad ; snout 

 broader than long, with convex upper profile ; eye 3 to 3J times in 

 length of head, about 1^ times in interorbital width; mouth with thick 

 upper lip, extending to below anterior border of eye or not quite so far ; 

 8 to 10 series of teeth in each jaw ; 4 series of scales on the cheek. 

 Gill-rakers short, 12 or 13 on lower part of anterior arch. Dorsal 

 XVII-XIX 9-10 ; spines increasing in length to the sixth or seventh, 

 which measures f to ^ length of head ; longest soft rays about f length 

 of head. Anal III 7-9; third spine as long as and stronger than 



