CICHLID PISHES OF LAKE NYASSA. 679 



2. Otopharyxx selenurus, sp. n. (Text-fig. 1. ) 



Depth of body 2^ in length, length of head 3^. Snout with 

 straight profile, as long as postorbital part of head. Diameter of 

 eye nearly equal to depth of praeorbital or cheek, 4 to 4| in 

 length of head, interorbital width 4. Jaws equal antei'iorly ; 

 maxillaiy not exteiiding to below eye ; teeth in 3 or 4 

 sei-ies, 50 to 55 bicuspid teeth in oviter series of upper jaw. 

 3 or 4 series of scales on cheek. 12 gill-rakers on lower part of 

 anterior arch. 35 scales in a longitudinal series, 6 from origin 

 of dorsal to lateral line. Dorsal XYT-XVII 11-12; last spine 

 i length of head, longest soft rays nearly as long as head. 

 Anal III 9 ; third spine stronger and shorter than last dorsal. 

 Pectoral as long as head, reaching anal. Caudal scaly, deeply 

 emarginate. Caudal peduncle 1| as long as deep. Bluish grey, 

 uniform or with traces of darker cross-bai\s. 



Text-fie-ure 1. 





Otopharynx selenv.rtts. \. 



Two specimens, 135 and 155 mm. in total length [Wood). 



A smaller example, 90 mm. long, is more slender (depth 3 in 

 length), but, except for juvenile characters, such as the larger eye 

 (3g in head), is very similar to the two described ; colour silvery, 

 with traces of several cross-bars ; an oblong dark spot on lateral 

 line below middle of spinous dorsal, a band along lower lateral 

 line. 



5. Chilotilapia Bouleng., 1908. 



Jaws with an outer series of stout, little compressed, teeth, 

 and 3 or 4 inner series of smaller subconical teeth, which are 

 stronger at the sides of the priemaxillaries than in front. 

 Scales cycloid or feebly denticulate. 



Nyassa ; a single species. 

 Proc. Zool. Soc— 1921, Ko. XLYI. 46 



