526 



Annals of the 



Ajrican Museum. 



6. PAKATILAPIA THUMBERGII, Cast. 



Chromis t/ntinlii'i-iji, Castrln., Mem. Puiss. At'r. Austr., p. 13 (1861). 



Chromis ngamensis, Casteln., I.e. 



? Chromis livingstonii, Casteln., I.e. 



Hemichromis robustus, Gruntli., Proc. Zool. Sue., 1864, p. 312. 



H emichromis jallae, Bouleng., Boll. Mus. Turin , xi, 1896, no. 260. 



Paratilapia robiista, Bouleng., Proc. Zool. Soe, , 1898, p. 141, and 

 Poiss. Bass. Congo, p. 414 (1901) ; Pellegr., Mi'm. Soc. Zool. France, 

 xvi, 1904, p. 266. 



Paratilapia thumberyii, Bouleug., Proc. Zool. Soc., 1898, p. 146, 

 Trans. Zool. Soc., xviii, 1911, p. 412, pi. xli, and Freshw. Fish. Africa, 

 iii, p. 328, fig. 220 (1915) ; Pellegr., i.e., p. 268. 



? Pelmatocliromls genisquamulatus, Pellegr., Bull. Soc. Zool. France, 

 xxxix, 1914, p. 27; Bouleng., Freshw. Fish. Africa, iv, p. 330 (191 r,). 







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FIG. 1-io. Paratilapia thumbergii. 



Teeth moderate, in two to four series. Depth of body 2f to 3i 

 times iii total length excluding caudal, length of head 2f to 3 times. 

 Head 2 to 2^ times as long as broad, upper profile straight, or slightly 

 convex or slightly concave ; lower jaw projecting ; snout obtusely 

 pointed, as long as or slightly longer than broad, shorter than post- 

 ocular part of head ; eye 41 (young) to 6 in length of head, nearly 

 equal to or less than iuterorbital width or preorbital depth ; mouth 

 extending to below anterior border of eye or a little beyond ; 7 to 

 9 series of scales on the cheek, width of scaly part 1?- to 2g- diameters 

 of eye. Gill-rakers moderately long, some of the posterior usually 

 bifid or trifid, 10 to 12 on lower part of anterior arch. 



