204 CICHLID.E. 



38. TILAPIA CHRISTYI, sp. n. 

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

 3|- times. Head nearly twice as long as broad ; snout with convex 

 upper profile, a little broader than long, as long as or a little shorter 

 than postocular part of head ; eye 4 times in length of head, 1|^ times 

 in interorbital width, equal to piseorbital depth ; mouth f width of head, 

 extending to between nostril and eye ; teeth in 4 series, outer largest, 

 40 to 50 in upper jaw, and separated from the others by a rather wide 

 interspace ; 3 or 4 series of scales on the cheek, w'dth of scaly part equal 

 to diameter of eye. Gill-rakers very short, 9 or 10 on lower part of 

 anterior arch. Dorsal XVI-XVII 12-13; last spine longest, J length 

 of head ; longest soft raysf to f length of head. Anal III 9-10 ; third 

 spine nearly ^ or f length of head. Pectoral as long as or a litile 

 longer than head, not reaching vertical of origin of anal. Ventral 

 produced into a filament, not reaching origin of anal. Caudal rounded, 

 scaled nearly all over. Caudal peduncle much deeper than long. Scales 



•^ Qi 21— '^3 



cycloid, 30-31 fin^; lateral lines -^^. Brownish; the scales on the 

 slides dark brown or blackish at the base ; six rather indistinct dark 

 cross-bars on the body ; a black opercular spot ; spinous dorsal with 

 large brown spots; a large black spot at the base of the anterior rays of 

 the soft dorsal, followed by blackish spots forming oblique streaks or a 

 network; caudal with round light spots in a brown network. 



Total length 180 millim. 



Upper Congo. — Types in Congo Museum, Tervueren. 

 1. One of the types. Stanley Fulls. Dr. 0. (^iristy (C ). 



39. TILAPIA BILINEATA. 



Pelle<rr. Bull. Mus. Paris, 1900, p. 276 ; Bouleng. Poiss. Bass. Congo, p. 470 

 (1901) ; Pellegr. Mem. Soc. Zool. France, xvi. 1901, p. 325, pi. v. fig. 1. 



Depth of body 2 J to 2f times in total length, length of head 3 to 3 J 

 times. Snout with slightly convex upper profile, If to H times as long 

 as eye, as long as or a little shorter than postocular part of head ; eye 

 3J to 4 times in length of head, a little less than interorbital width; 

 mouth ^ width of head, extending to between nostril and eye ; teeth in 

 4 to 6 serits, outer largest, 50 to 78 in upper jaw ; 3 or 4 series of scales 

 on the cheek. Gill-rakers short, 10 on lower part of anterior arch. 



