IIEMITILAPIA. 



4'Jl 



2. IIEMITILAPIA BAYONI. 

 Bouleng. Ann. Mas. Geneva, (3) iv. 1908, p. 6, fi«>-., and v. 1911, p. Cd. 



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

 oj times. Head 2 to 2^ times as long as broad ; snout obtuse, with 

 straight upper profile, as long as eye, which is 3j 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, tlie 

 outer mucli 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 



Pig. 340. 



Ilemifilapia hayonl. 

 Type (4.nn. 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 -| length of head. Anal III 8-9 ; third spine longest, 

 neaily half length of head. Pectoral pointed, as long as head, not (piite 

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

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

 late, 31-32 jo-j'a' lateral lines -^^g". Yellowisli 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 tijc end in males. 



Total length 9-3 millim. 



Lake Victoria and Victoria Nile. — Tvjtes in (irnoa Museum. 



