CICHLID FISHES OF LAKE VICTORIA. 161 



anteriorly, becoming a single series laterally, conical or com- 

 pressed, nuicLispid, or outer mostly bicuspid and inner tricuspid. 



Afiica and Syi'ia. 



All the species described below are peculiar to L. Victoria and 

 the Victoria, Nile. Haplocli.romis ohliq widens, the type species, 

 has a dentition unlike that of most of the species which have 

 been placed in this genus, but the discoveiy of a species in 

 L. Kivu (H. astatodon) some individuals of which have a typical 

 CtenoGhromis dentition, whilst others approximate to H. ohli- 

 qioidens, makes it possible to regard this difference as only sub- 

 generic and to still include species with conical or cuspidate 

 teeth in Haplochromis. 



Synopsis of the L. Victoria Spedies. 



I. Teeth slender, cuspidate, in 5 to 8 series, tlie inner well developed and not 



separated by a distinct interspace from the outermost. {Neochromis Regan.) 

 Snout usually a little projecting beyond lower jaw, which is 



short and broad, about j length of head 1. nigricans. 



Jaws equal or lower slightly' projecting, relatively slender, 



about i length of head 2. nucliisquamulatus. 



II. Outermost series of teeth conical or bicuspid, enlarged, separated by an inter- 



space from the smaller inner teeth. {Cienochromis Pfefter.) 



A. Jaws equal anteriorlj', or lower shorter than upper, or rarely slightly pro- 



jecting. 



1. Lips not produced into lobes. 



a. Interorbital width not move than ij length of head. 

 a. Pharyngeal teeth slender. 



* Jjower jaw not shorter than upper ; lips normal. 

 Caudal rounded ; caudal peduncle as long as deep ; maxillarj- 



extending to below anterior part of eye 3. gestri. 



Caudal subtruncate ; caudal peduncle longer than deep : 



maxillary extending to below anterior edge of eye 4. nubilus. 



Caudal truncate ; 11 or 12 gill-rakers on lower part of 



anterior arcli 5. melanopus. 



Caudal truncate ; 9 or 10 gill-rakers ; eye 3 in head, twice 



prffiorbital depth 6. macrops. 



Caudal truncate ; 7 to 10 gill-rakers ; eye more than 3 in head 7. cinereus. 



** Lower jaw not shorter than upper ; lips thick. 

 Teeth in 4 to 8 series, 30 to 46 in outer series of upper jaw... 8. sauvagei. 

 Teeth in 3 to 5 series, 20 to 24 in outer series of upper jaw ... 9. crassilabris. 



*** Lower jaw shorter than upper 10. annectens. 



(3. Middle pharyngeal teeth stout, siibconical ... 11. liumilior. 



y . Pharyngeal teeth large, obtuse 12. ishmaeli. 



b. Interorbital width more tb.an ^ length of head . 13. obestis. 



2. Lips thick, each produced into a lobe anteriorly ... 14. chilotes. 



B. Lower jaw distinctly, but usually not strongly, projectmg, 

 A. Outer teeth numerous, close together. 



1. Maxillary not extending to below eye 15. tceniatus, 



2. Maxillary extending to below^ eye, or nearly. 



a. Eye A length of head or more (in specimens of 



100 to 110 mm.) 16. martini. 



b. Eye less than ^ length of head, except in the very young. 

 a. Prffimaxillary pedicels extending to be- 

 tween anterior edges of orbits 17. nigrescens. 



/3. Prremaxillary pedicels not reaching orbits. 

 * Caudal peduncle Ij to 2 as long as deep. 

 D. XIV-XV 9-10. 8 or 9 gill-rakers on lower part of 



anterior arch IQ. fla vipimi is. 



Proc. Zool. Soc— 1922, No. XI. 11 



