678 MR. C. TATE EEGAN ON THE ,j 



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

 Snout with straight or concave profile, from as long as to 

 1| diameter of eye, which is 3^ to 5| in length of head, in adult - jj 



equal to pra3orbital depth ; interorbital width 3| to 4 in head. ~ I 



Jaws equal ; maxillai-y not extending to below eye. 3 or 4 series 

 of scales on cheek, 12 or 13 gill-rakers on lower part of anterior 

 arch. Pharyngeal teeth small. 33 to 35 scales in a longitudinal 

 series, 5 or 6 from origin of dorsal to lateral line. Dorsal XYI 

 10-11 ; last spine from less than |- to g length of head. 

 Anal III 9-10 ; third spine from less than ^ to more than 4 head. 

 Pectoral as long as or a little shorter than head. Caudal scaly, 

 truncate or slightly emarginate. Caudal peduncle longer than 

 deep. A dark spot on operculum, usually two on lateral line 

 below spinous and soft dorsal respectively and another at base of ; 



caudal. Dorsal and caudal spotted with orange ; anal with long- 

 spots between the rays ; males with dorsal, anal, and pelvic fins 

 darker, pale-edged. 



Seven specimens, 90 to 190 mm. long. (Jloore, lihoades, Wood). 



4. Otopharynx Regan, 1920 

 (type Tilcqyia auromarginata Bouleng.). 



As Tilcqna, but the prootic forms part of the facet for articu- 

 lation of the upper pharyngeal on each side. 

 ISTyassa ; two species. 



1. Otopharynx AUROMARGiNATUs Bouleng., 1908. 



Tilapia auromaryinata Bouleng. Cat. Afr. Fish. iii. p. 180, 

 fig. 115. 



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

 Snout decurved, as long as or a little shorter than postorbital 

 part of head. Diameter of eye equal to depth of prseorbital, 

 3t to 4 in length of head ; interorbital width 3 to 3^. Jaws 

 equal anteriorly : maxillary not extending to below eye ; teeth in 



3 to 5 series, inner tricuspid or conical ; 60 to 75 in outer series 

 of upper jaw, the anterior bicuspid, the postei'ior conical. 



4 series of scales on cheek. 15 to 18 gill-rakers on lower part of 

 anterior arch. Pharyngeal teeth small. Scales cycloid, 33 or 34 

 in a longitudinal series, 5 or 6 from origin of dorsal to lateral 

 line. Dorsal XVII-XVIII 10-11 ; last spine f length of head 

 or a little more. Anal III 9-10; third spine stronger than 

 dorsals, \ head or a little more. Pectoral as long as head, not 

 reaching anal. Caudal densely scaled, emarginate. Caudal 

 peduncle 1^ as long as deep. Bluish; dorsal and anal dark 

 blue with yellow edge ; dorsal with series of red spots. 



Two specimens, 205 and 240 mm. in length, and a skeleton. 



