HEMITILAPIA. 



491 



2. HEMITILAPIA BAYONI. 

 Bouleng. Ann. Mas. Geneva, (3) iv. 1908, p. 6, fig., and v. 1911, p. G9. 

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

 84 times. Head 2 to 2| times as long as broad ; snout obtuse, with 

 straight upper profile, as long as eye, which is S^ or 3^ 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 mucli larger than the others and numbering 50 to 60 in upper 

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



Fig. 3-tO. 



Ilemkilapia hai/oni. 

 Type (Ann. Miis. Geneva, 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, 

 ueaily 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-j times as long as deep. Scales denticu- 

 late, 31-32 j2_i3; lateral lines -31^. Yellowish olive, with or without 

 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. 



