514 CICHLIME. 



II. 17 to 25 gill-rakers on lower part o£ anterior arch ; two or three series of scales on the cheek; 

 scales with smooth edge ; D. XV-XVIII 10-15 ; pectoral fin usually longer than head. 

 Mouth extending to below anterior border of eye, or between nostril 

 and eye ; caudal fin rounded in the adult; caudal peduncle deeper 



than long 6. T. nilotica, L. 



Mouth extending to between nostril and eye ; caudal fin truncate ; 



caudal peduncle as long as deep, or a little longer than deep . . . 7. T. variabilis, Blgr. 

 Mouth extending to below nostril; caudal fin truncate or slightly 



notched; caudal peduncle deeper than long .8. T. galilcea, Art. 



1. TILAPIA MARTINI. 

 (Plate XCI. fig. 2.) 



Boulenger, Ann. & Mag. X. H. (7) xvii. 1906, p. 449. 



Depth of body twice and three-fifths to three times in the total length, length of head 

 twice and four-fifths to three times ; body deepest at the nape. Profile of snout 

 descending in a steep oblique line ; diameter of eye greater than the length of the 

 snout, twice and two-thirds to three times in the length of the head, twice the least 

 width of the prseorbital ; interorbital width equal to the length of the snout ; mouth 

 not very oblique, extending to below the anterior third of the eye ; teeth small, in three 

 or four series in both jaws, the outer largest and numbering 40 to 70 in the upper jaw ; 

 four or five series of scales on the cheek, the depth of the scaly part below the eye equal 

 to or less than the diameter of the eye ; large scales on the opercle. Gill-rakers short, 

 some T-shaped, 8 or 9 on lower part of anterior arch. Dorsal fin with 15 or 16 spines 

 and 8 to 10 soft rays; spines equal from the eighth or ninth, one-third to two-fifths 

 the length of the head ; longest soft rays one-third to three-fifths the length of the 

 head. Anal fin with 3 spines and 8 or 9 soft rays ; third spine as long as and stronger 

 than the longest dorsal. Pectoral fin as long as the head, reaching beyond the vertical 

 of the origin of the anal. Ventral fin reaching the origin of the anal or a little 

 beyond. Caudal fin truncate. Caudal peduncle once and two-thirds as long as deep. 

 Scales feebly denticulate, 32-33 i^ 6 ; lateral lines -j-^. 



Yellowish olive above, white beneath ; a dark vertical bar below the eye and 

 a cross-bar on the forehead ; a blackish opercular spot ; a blackish stripe from the 

 latter to the root of the caudal fin ; a second, more or less distinct dark stripe higher 

 up on the side of the back; one specimen is uniform dark grey; dorsal and anal fins 

 greyish, with more or less distinct round darker spots ; pectoral and anal fins yellow, 

 the latter sometimes with one or two orange ocellar spots in the posterior part ; 

 ventral fins yellow in the females, black in the males. 



