CICHLID FISHES OF LAKE NYASSA. 703 



arch. Pharyngeal teeth small. 31 to 34 scales in a longitudinal 

 series, 5 or 6 from origin of doi'sal to lateral line. Dorsal XV- 

 XVI 9-11 ; last spine f to | length of head. Anal III 9-11 ; 

 third spine about |- head. Pectoral as long as head, reaching 

 anal. Caudal scaly, slightly emarginate. Caudal peduncle as 

 long as or a little longer than deep. Silvery with four blackish 

 spots, one on operculum, the second on and under lateral line 

 below spinous dorsal, the third below soft dorsal, the fourth at 

 base of caudal ; males usually darker, often with yellow back. 

 Several specimens, 100 to 130 mm. long, 



25. Haplochromis quadrimaculatus, sp. n. 



Paratilapia intermedia (part.) Bouleng. Cat. Afr. Fish. iii. 

 p. 363. 



Depth of body 2^ to 2| in length, length of head 3 to 3|. 

 Snout with straight profile, shorter than postorbital part of head. 

 Diameter of eye 4 to 4| in length of head, depth of prseorbital 

 5 to 5^, intei-orbital width 3|. Jaws equal or lower slightly 

 projecting ; prtemaxillary pedicels extending to between anterior 

 edges of orbits, |- length of head ; maxillary not extending 

 to below eye ; teeth small, conical, in 2 or 3 series. 2 or 3 

 series of scales on cheek, 24 to 27 gill-rakers on lower part 

 of anterior arch. Pharyngeal teeth small. 34 to 36 scales in a 

 longitudinal series, 5 or 6 froin origin of dorsal to lateral line. 

 Dorsal XVII-X VIII 11-12 ; spines equal or slightly increasing 

 from seventh or eighth, last | to ^ length of head. Anal III 

 10-12 ; third spine 3- to |- head. Pectoral as long as or shorter 

 than head, not or barely reaching anal. Caudal scaly, emaiginate. 

 Caudal peduncle a little longer than deep. A blackish spot on 

 operculum, a second under lateral line below spinous dorsal, 

 usually a third between lateral lines and a fourth at base of 

 caudal. 



Seven specimens {Rhoades, Whyte), 170 to 200 mm. long. 



26. Haplochromis sph^rodon, sp. n. (Text-fig. 16.) 

 Tilapia lateristriga (part.) Bouleng, Cat. Afr, Fish. iii. p. 253. 

 Depth of body 2| to 3 in length, length of head 3 to 3|. 



Snout with straight profile, as long as or a little shorter than 

 diameter of eye, which is 3 to 3^ in length of head, interorbital 

 width 4, prseorbital depth 5. Jaws equal anteriorly ; maxillary 

 not extending to below eye ; teeth in 4 to 6 series, 40 to 60 

 bicuspid teeth in outer series of upper jaw. 2 to 4 series of 

 scales on cheek. 9 or 10 gill-rakers on lower part of anterior 

 arch. Middle pharyngeal teeth large, with spherical crowns. 

 31 or 32 scales in a longitudinal series, 5 from origin of dorsal 

 to lateral line. Dorsal XV-XVI 10-12 ; last spine about f 

 length of head. Anal III 8-9 ; third spine usually a little 

 shorter than last dorsal. Pectoral about as long as head, reaching 



