FEOM THE LAKE NGAMI BASIN, BECHUANALAND, 409 



CiCHLIDiE. 



14. Hemicheomis fasciatus Peters, 



Known from the Atlantic watershed of Africa from Senegambia to Angola, and 

 from the Chad Basin. 



15. Paeatilapia feedeeici Casteln. (Plate XXXIX. fig. 1.) 

 Chromys frederici Casteln. op. cit. p. 15. 



" Longueur, m. 23. — Corps assez eleve ; pectorales non prolongees ; ecailles 

 couvertes de fines granulations, excepte sur le bord qui est lisse, au nombre de 22 sur la 

 portion superieure de la ligne laterale, et de 14 sur I'inferieure. Dents tres peu 

 nombreuses, surtout a la machoire superieure, toutes tres ecartees les unes des autres, 

 coniques et pointues, placees sur une seule ligne, si ce n'est en avant, a la machoire 

 inferieure. Corps d'un blanc gris ; caudale rougeatre ; anale rouge ; pectorales d'uu 

 blanc sale ; ventrales d'un vert peu prononce ; dorsale grise, avec les pointes 

 rougeatres. 



"Dorsale, 15/14. — Anale, 3/8. — Caudale, 16 grands rayons. — Pectorales, 13. — 

 Ventrales, 5." 



The following description is drawn up from three specimens, differing among them- 

 selves, as well as from Castelnau's definition, in the coloration, and for which, on 

 account of the number of scales and fin-rays, as well as of the rather feeble dentition, 

 I propose the name oi Paratilapia frederici. 



Depth of body 2^ times in total length, length of head 3 times. Head twice, or a 

 little over twice, as long as broad, upper profile slightly concave in front of eyes, jaws 

 equal in front ; snout rounded, as long as broad, as long as or slightly longer than 

 postocular part of head ; eye 5 to 5^^ times in length of head, 1^ or 1^ times in 

 interorbital width, less than prseorbital width ; mouth not extending to below anterior 

 border of eye; teeth in outer series rather small, 25 to 30 on each side of upper jaw, 

 followed by one or two irregular series of minute teeth confined to the anterior part of 

 the jaws; 3 or 4 series of scales on the cheek, the vertical diameter of the scaly part 

 greater than diameter of eye. Gill-rakers short, knob-like or anvil-shaped, 11 or 

 12 on lower part of anterior arch. Dorsal XV 13-14 ; spines increasing in length to 

 the last, which is about | length of head ; longest soft ray f to f length of head. 

 Anal III 8-9 ; third spine longest, -J length of head. Pectoral f to f length of head, 

 not reaching vertical of origin of anal. Ventral reaching vent. Caudal rounded. 

 Caudal peduncle as long as deep. Scales rugose, not denticulated, 32-34 ^ ; 

 lat 1 ?^^ 



The three specimens in the collection difier, as I have said, in the coloration. One 

 (native name : Nchu), sketched by Mr. Woosnam, is olive-green above, shading to pale 



3k2 



