180 



CICHLIDjE. 



20. TILAPIA AUROMARGINATA. 

 Bouleng. Ann. & Mag. N. II. (8) ii. 1908, p. 241. 



Depth of body 2| times in total length, length of head 3^ to ?>\ times. 

 Head twice as long as broad ; snout rounded, with straight or slightly 

 convex upper profile, nearly as long as broad, as long as postocular 

 part of head ; eye 3^ to 4 times in length of head, If times in 

 interorbital width, equal to prseorbital depth ; mouth moderate, § width 

 of head, extending to between nostril and eye ; teeth small, many on 

 the sides simply conical, in 4 or 5 series, 60 to 80 in outer series of 

 upper jaw; 3 or 4 series of scales on the cheek, width of scaly part 

 equal to diameter of eye. Gill-rakers rather short, tuberculate, 15 to 17 



Fig. 115. 



Tdapia auromarginata. 

 Type. |. 



on lower part of anterior arch. Dorsal XVII— XVIII 11 ; spines 

 increasing in length to the last, which is a little less than ^ length of 

 head; longest soft rays f to f length of head. Anal III 10; third 

 spine f length of head. Pectoral as long as head, not reaching origin of 

 anal. Ventral reaching origin of anal. Caudal densely scaled, distinctly 

 emarginate. Caudal peduncle \\ to If times as long as deep. Scales 

 cycloid or very indistinctly denticulate, 33-35 p^ ; lateral lines jr-ifs. 

 Dark blue above, bluish white beneath; dorsal and anal dark blue, 



