TILAPIA. 259 



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

 straight or slightly convex upper profile, as long as or slightly longer 

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

 eye shorter than snout, 3J to 4 times in length of head, equal to or a 

 little less than interorbital width, exceeding least depth of prseorbital ; 

 mouth moderate, about § width of head, extending to between nostril 

 and eye, end of maxillary exposed ; teeth in 3 to 5 series, outer 

 moderately large, 46 to 50 in upper jaw ; 4 or 5 series of scales on the 

 cheek, width of scaly part equal to or a little less than diameter of eye. 

 Gill-rakers short, 12 or 13 on lower part of anterior arch. Dorsal 

 XIII-XIV 10-13; last spine longest, f to f length of head; longest 

 soft rays at least f length of head, sometimes much produced and longer 

 than head. Anal III 7-9 ; third spine longer than last dorsal. Pectoral 

 as long as or a little shorter than head, not extending to vertical of 

 origin of anal. Ventral reaching vent or origin of anal. Caudal more 

 or less strongly emarginate. Caudal peduncle as long as deep or slightly 

 deeper than long. Scales finely denticulate, 32-34 ff^; lateral lines 

 1^. Uniform brown, or brownish above with five dark bars or two or 

 three dark spots on each side. 



Total length 220 millim. 



Madagascar. — T}pes in Leyden Museum. 



1-3. Ad. & hgr. Tamatave. Rev. W. D. Cowan (C). 



4. Skel. „ " 

 5-7. Ad. Mahanova. 



5, 9. Ad. & hgr. Imerina. Rev. R. Baron ((J.). 



10. Ad. Fenerive. Paris Museum (E.). 



11. Ad. L. Tongobory. n 



88. TILAPIA BETSILEANA. 



Bouleng. Proc. Zool. Soc. 1899, p. 139, fig. 



Ptuclwchromis oligacanthus, part., Pellegr. Mein. Soc. Zool. France, xvi. 1904, 



p. 347. 

 Ptijchochromis hetsileanus, Pellegr. Bull. Mus. Paris, 1907, p. 323. 



Depth of body 2 to 2^ times in total length, length of head 2| to o\ 

 times. Head twice as long as broad ; a more or less developed frontal 

 gibbosity in adult specimens ; snout rounded, with straight or slightly 

 convex upper profile, nearly as long as broad, as long as or a little 



s: 



