HEMITILAPIA. 



491 



2. HEMITILAPIA BAYONI. 

 Bouleng. Ann. Mus. Genova, (3) iv. 1908, p. 6, fig., and v. 1911, p. 09. 



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

 3 J times. Head 2 to 2-J times as long as broad ; snout obtuse, with 

 straight upper profile, as long as eye, which is 3^ or 3-g- times in 

 length of head and equals interorbital width ; mouth extending nearly 

 to below anterior border of eye ; four series of teeth in each jaw, the 

 outer much larger than the others and numbering 50 to GO in upper 

 jaw ; 3 series of scales on the cheek. Gill-rakers short, 9 or 10 on 



Tier. 340. 



Ilemitilapia bayoni. 

 Type (Ann. Mus. Genova, 1908). 



lower part of anterior arch. Dorsal XV-XVI 9 ; spines increasing 

 in length to the last, which measures about half length of head ; longest 

 soft ray about -f length of head. Anal III 8-9 ; third spine longest, 

 nearly half length of head. Pectoral pointed, as long as head, not quite 

 reaching vertical of origin of anal. Ventral reaching vent. Caudal 

 truncate. Caudal peduncle 1^ times as long as deep. Scales denticu- 



Yellowish olive, with or without 



late, 31-32 j^g ; lateral lines -^ 



7 to 9 more or less distinct darker vertical bars on the body ; a dark 

 opercular spot ; fins greyish, ventrals blackish at the end in males. 



Total length 95 millim. 



Lake Victoria and Victoria Nile. — Types in Genoa Museum. 



