TIL API A 



253 



83. TILAPIA LATEHISTRIGA. 

 Chroinis latenstriga, part., Giiiitli. Proc. Zool. Soc. ISG-I-, p. 312. 



Depth of body 2i to 3 times in total length, length of head 3 to 05 

 times. Head 2 to 2J times as long as broa.d ; snout rounded, with 

 straight upper profile, as long as broad, as long as postocular part of 

 liead ; eye 3 (young) to 4 times in length of head, 1 to 1^ times in 

 iuterorbital width, equal to prseorbital depth in adult ; snout moderate, 



Fig. 170. 



I'llapia laterislriga. 

 L. Nyassa. |. 



I to I width of head, extending to between nostril and eye ; teeth rather 

 small, in 3 to 5 series, 40 to 70 in outer series of up[)er jaw; 3 or 4 

 series of scales on the cheek, w'idth of scaly part equal to or a little less 

 than diameter of eye. Gill-rakers rather short, 9 to 13 on lower part of 

 anterior arch. Dorsal XV-XVI 10-12 ; spines increasing in length to 

 the last, which is J to J length of head ; longest soft rays i to § length 

 of head in females, produced and as long as head in males. Anal 

 III 8-10; third spine J to | length of head. Pectoral as long as or a 

 little longer than head, reaching or nearly reaching origin of anal. 

 Ventral reaching vent or anal. Caudal scaled, densely in large specimens, 

 feebly but distinctly emarginate. Caudal ])eduncle 1^ to 1^ times 

 as long as deep. Stales very finely denticulate, 32-33 x\_1^', lateral 



