188 CICHLID^. 



a little broader than long, ^ postocular part of head ; eye 4 (yoting) 

 to 6 times in length of head, 1^ to 2 times in interorbital width, 

 equal to or a little greater than least depth of pr;eorbital ; mouth 

 moderate, about f width of head, extending to between nostril and eye ; 

 teeth very small, in 2 or 3 rows, outer with extremely slender shaft, 

 50 to 60 in upper jaw ; 3 series of scales on the cheek, width of scaly 

 part equal to diameter of eye. Gill-iakers short, 14 or 15 on lower part 

 of anterior arch. Dorsal XII-XIII 10-12 ; spines increasing in length 

 to the last, which measures nearly ^ length of head ; longest soft rays 

 not much longer. Anal III 9-10; third spine f length of head. 

 Pectoral f to f length of head, not reaching vertical of origin of anal. 

 Ventral reaching vent. Caudal truncate (?). Caudal peduncle 1-^ times 

 as long as deep. Scales cycloid, extremely small on breast and belly, 

 30-32 jij::TQ; lateral lines ^^j. Silvery grey, each scale with a bluish 

 central spot; soft dorsal brownish at the base, with oblique series of 

 light spots. 



Total length 115 millim. 



Lake Manyara, a salt lake S.W. of Mt. Kilimanjaro, German East 

 Africa. — Types in Berlin Museum. 



1-5. Types. L. Manyara. Prof. 0. Neiuiiauu (C). 



27. TILAPIA AMPHIMELAS. 

 Hilgend. Zool. Jahrb., Syst. xxii. 1905, p. 405. 



Agrees very closely with the preceding, of which, as suggested by its 

 describer, it is perhaps the male. Outer teeth mostly uuicuspid. 

 Caudal peduncle as long as deep. D. XIII 11; A. Ill 10. Scales 

 apparently as in the preceding. Dirty green, the centres of the scales 

 silvery ; breast, belly, ventrals, dorsal, and anal black ; caudal greenish 

 yellow ; young with about 10 dark cross-bars. 



Total length 136 millim. 



Lake Manyara. — Types in Berlin Museum. 



28. TILAPIA ALCALICA. 

 Hilgend. Zool. Jahrb., Syst. xxii. 1905, p. 407. 



Depth of body equal to length of head, 2| to 2| times in total 

 length. Head If or If times as long as broad ; snout rounded, with 

 straight or slightly convex upper profile, a little broader than long, 

 f postocular part of head ; eye 3^- to 4^ times in length of head, a little 



