20i CICHLID.E. 



38. TILAPIA CHRTSTYI, sp. n. 



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

 of 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, If 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, width of scaly part equal 

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

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

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

 spine nearly f or f length of head. Pectoral as hing as or a lit.le 

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

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

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

 cycloid, 30-31 jj£j2; lateral lines -j^p^. Brownish; the scales on the 

 sides 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, Tcrvueren. 

 1. One of the types. Stanley Falls. Dr. G. (^iristy (C ). 



39. TILAPIA BILIXEATA. 

 rvWe^r. Bull. Miis. Paris, 1900, p. 27 C : Boiileng. Poiss. Bass. Congo, p. 470 

 (1901) ; Pellegr. Mein. Soc. Zool. France, xvi. 1904, p. 325, pi. v. fig. 1. 



Depth of body 2| to 2-| times in total length, length of head 3 to 3i 

 times. Snout with slightly convex upper profile, 1^ to 1^ times as long 

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

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

 mouth I 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. 



