174 



CICHUD^E. 



Cliromis rangii, Rochebr. Actes Soe. Linn. Bord. (4) vi. 1883, p. 133. 

 Tilapia microcephala, Bonleng. Proc. Zool. Soc. 1899, p. 114; Lbnnb. Ann. & Mag. 

 N. H. (7) xii. 1903, p. 41. 



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

 3 times. Head If to 2 times as long as broad ; snout rounded, with 

 straight or convex upper profile, as long as broad or a little broader than 

 long, f to j postocular part of head ; eye 3 (young) to 5 times in length 

 of head, 1 (young) to If times interorbital width, much shorter than 

 prasorbital depth in adult ; mouth rather small, \ to f width of head, 

 extending to below nostril or a little beyond ; teeth in 3 (young) to 



Fig. 111. 



Tilapia heudeloti. 

 Senegal. ±. 



7 series, 40 (young) to 110 in outer series of upper jaw ; 2 or 3 series of 

 scales on the cheek, width of scaly part not more than diameter of eye. 

 Gill-rakers short, 15 to 19 on lower part of anterior arch. Dorsal XV- 

 XV T I (rarely XIV or XVII) 11-13 ; spines subequal from the sixth, or 

 last longest, f to J length of head ; longest soft ray f to f length of 

 head. Anal III 8-11 ; third spine f to f length of head. Pectoral 1\ 

 to 1^ times as long as head, reaching vertical of origin of anal, or beyond. 

 Ventral reaching anal or vent, or not quite so far. Caudal truncate or 

 feebly but distinctly emarginate. Caudal peduncle deeper than long. 



Scales cycloid, 27-30 j^jg ; lateral lines ^fjj. 



Olive above, golden 



