484 CICHLIDJE. 



3. PELMATOCHROMIS. 



Steindachner, Notes Leyd. Mus. xvi. 1894, p. 40 ; Boulenger, Proc. Zool. Soc. 1898, p. 147, and 



Poiss. Bass. Congo, p. 433 (1901) ; Pellegrin, Mem. Soc. Zool. France, xvi. 1904, p. 275. 

 Chromidotilapia, Boulenger, Proc. Zool. Soc. 1898, p. 151. 



Barely distinguishable from Paratilapia by the great development of a papillose pad 

 on each side of the pharynx, between the gills, strongly projecting in front of the 

 upper branch of the first branchial arch *. 



The young of all the species here described have bi- or tricuspid teeth in both jaws ; 

 some of the inner teeth may remain tricuspid in the adult, as frequently happens in 

 the preceding genus. 



About twenty-five species are known from Tropical Africa f , five of which are 

 represented in Lake Victoria. 



Synopsis of the Species. 



I. Teeth in three to six series, outer large and curved in the adult ; lower jaw projecting ; snout 



much longer than the eye ; pectoral fin shorter than the head. 

 Length o£ head not three times in total length ; five or six series of scales 



on the cheek ; pectoral not reaching origin of anal ; scales 37-45 jjr-jg. 1. P. cavifrons, Hilg. 

 Length of head not three times in total length ; three to five series of scales 



on the cheek ; pectoral reaching origin of anal or a little beyond ; 



scales 30-33 ^~ 2 - P ' s P ekii > B1 g r ' 



Length of head three times in total length ; six series of scales on the 



cheek ; pectoral not reaching origin of anal; scales 31 ^ .... 3. P.flavipimiis, Blgr. 



II. Teeth in two or three series, outer very small, inner minute ; lower jaw not projecting ; 



snout once to once and one-third diameter of eye ; pectoral fin as long as head ; length of 



4-5 

 head three times in total length ; three or four series of scales on the cheek ; scales 32 llZ ^. 



Depth of body three times in total length ; snout as long as broad ; 



prseorbital a little narrower than the eye 4. P. microdon, Blgr. 



Depth of body twice to twice and a half in total length ; snout twice as 



broad as long ; prseorbital much narrower than the eye 5. P. obesus, Blgr. 



* Cf. Plate LXXXVIII. fig. 2 a. 



f Liberia, Lower Niger, Cameroon, Gaboon, Congo, Lakes Victoria and Tanganyika. 



