38 Mr. (I T. Reg-.in—ClassiJication of 



l^roxiinally, not or barely reaching fionfcals ; posterior part 

 of parasplienoid more or less ilisfiuctly raised, bearing a pair 

 of transverse oval facets for articulation of upper pharyngeals. 

 'VertebrrxB 26-33 (14-17 + 12-10); third with a pair of in- 

 ferior apophyses which unite below ; proecaudals with |)ara- 

 jiophysos from the fourth, the last or last two pairs oach 

 connected by a bridge ; ribs, except the first, on parapo- 

 physds. 



Africa and Syria. 



As restricted l)y the above definition this is a large and 

 varied genus, which nearly corresponds to Bt)ulenger's 

 section I. (scales cycloid or feebly denticulate) with the 

 exception of T. auromut'i/inat'i *. A complete revision will 

 be necessary before a final decision can be reached as to 

 whether it should be split up. At present I am incline! 

 to recognize four subgenera, as follows: — 



I. Lower pharyngeal with short auterior blade. 



Ethmoid united with vomer by suture Coptodon. 



Ethmoid free from vomor ; maxillary concealed; inner 

 edges of rami of lower jaw curved anteriorly ; 

 pharyngeal teeth slender Tilapia. 



Ethmoid free from vomer; outer teeth of jaws much 

 expanded ; end of maxillary exposed ; inner edges 

 of rami of lower jaw straight ; middle pharyngeal 

 teeth rather stout Jleterolilajna 



II. lAiwer pharyngeal with long anterior blade; 

 maxillary concealed ; inner edges of mnndibulnr 

 rami curved anteriorly ; pliuryngeal teeth small, 

 slender, uumorous Sarotherodun. 



Of those subgenera Coptodon includes T. zil/itaud T. htisu- 

 mana, ilete.rotilnpin is a new subgenus formed for T. huetli- 

 koferi, which has a very characteristic dentition ; the stout 

 j)haryngeal teeth are bicuspid, with the posterior cusp large 

 and obtuse and the anterior represented by a transverse ridge 

 Avhich may liear 2 or 3 denticles. Sdrotherodon {Melano- 

 ffp.ueSy Oreochromis) includes the species of the shirana^ 

 nil(jtica, galHrea, iiud macrocephala groups. A species of this 

 subgeiins {T. nilotica) has reached Tanganyika, probably 

 througli Lake Kivu. 



3. NeOTILAPIA, gen. nov. 

 (type Chromis tanganica:, Giinth.). 



Dorsal XVI-XVII 11-13. Anal III 0-10. Scales 



♦ Otophart/n:v, gen. nov. (type T. auromartjinata, Boulong.) ; differs 

 from Tiliipin in that the prootic forms part of the ]))iaryngi'al facet on 

 each side: very m-ar Vhihtilapia. 



