CICHLID FISHES OF LAKE NYASSA. 



721 



4. Lethrinops leptodon, sp. n. (Text-fig. 29.) 



Depth of body 2f to 3 in length, length of head 24- to 3i. 

 Snont with steep, straight or slightly convex profile, as long as or 

 a little shorter than postorbital part of head. Interorbital region 

 convex. Diameter of eye 3| to 4 in length of head, interorbital 

 width 3| to 5, depth of'^prfeorbital 3 to 3k. Lower jaw slightly 

 projecting ; maxillary not extending to below eye ; teeth in 3 or 

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

 on lower part of anterior arch. Lower pharyngeal Avith the last 

 few teeth of the two middle series a little enlarged. 31 to 34 

 scales in a longitudinal series, 5 or 6 from origin of dorsnl to 

 lateral line. Dorsal XY-XVl 10-13 ; last spine | to | length of 

 head. Anal III 9-10 ; third spine 1 to f head. Pectoral nearly 



Text-figure 29. 



A^^ 



JLethrinops leptodon. f. 



as long as head, reaching anal. Caudal scaly, emarginate. 

 Caudal peduncle 1^ to 1| as long as deep. Silvery or bluish, 

 with faint dark cross-bavs ; an opercular spot ; an oblong dark 

 blotch on lateral line below spinous dorsal, from just below 

 which a dark band runs backwards to the caudal ; doisal and 

 caudal with series of orange spots ; dorsal sometimes with a 

 yellow edge ; anal with several ocelli in males. 



Eight specimens, 140 to 180 mm. in total length {Wood). 



12. DociMODUs Bouleng., 1896. 



Differs from Haplochroyais in the dentition. Teeth compressed, 

 uni- or tri-cuspid, in 4 or 5 well-separated series; outer teeth 

 large, forming a close-set series of about 20 in each jaw. 



Nyassa ; a single species. 



