146 MR. G. A. BOI7LEX6EB ON THE AFRICAN AND [Mar. 1, 



long teeth rather wide apart. Lower jaw projecting. Depth 

 of body 3^ times in total length, length of head 3 times. Snout 

 with convex upper profile, twice as long as the eye ; diameter of 

 eye 5 to 5| times in length of head, Ij in interorbital width; 

 maxillary not extending to below anterior border of eyes ; 4 or 5 

 series of scales on the cheek ; large scales on the opercle. Gill- 

 rakers short, 11 on lower part of anterior arch. Dorsal XVI 10-11 ; 

 spines increasing in length to the last, which measures ^ length of 

 head and about | longest soft rays. Pectoral | length of head. 

 Yentral not reaching vent. Anal III 10-11 ; third spine longest, 

 as long as middle dorsal spines. Caudal very slightly emarginate. 

 Caudal peduncle If to 2 times as long as deep. Scales not denti- 

 culate, 35-36 —^ ; lat. 1. ff . Olive-brown above, silvery beneath ; 

 a blackish stripe from above the pectoral to the base of the caudal ; 

 fins whitish, unspotted. 



Total length 220 millim. 



Lake Nyassa and Upper Shire Eiver. 



18. Pabatilapia longiceps. 



Hemichromis hngiceps, Griinth. Proc. Zool. Soc. 1864, p. 313. 



Teeth in 2 series in both jaws, outer largest, long and sharp 

 and rather wide apart. Depth of body 4 times in total length, 

 length of head 2f to 3 times. Snout long and strongly compressed, 

 with convex upper profile ; diameter of eye 2 to 2| times in length 

 of snout, 5 to b\ times in length of head, 1^ in interorbital width; 

 maxillary widely separated from the vertical of the eye ; 3 series 

 of scales on the cheek ; opercle partially naked. Gill-rakers 

 rather long, about \ length of gill-fringes, 17 on lower part of 

 anterior arch. Dorsal XVII-XVIII 12; spines increasing in 

 length to the last, which measures | length of head. Pectoral f 

 length of head. '\'entral not reaching vent. Anal III 9-10'] 

 third spine longest, as long as last dorsal. Caudal slightly emar- 

 ginate. Caudal peduncle nearly twice as long as deep. Scales 

 finely denticulate on the border, 40-41 ^J ; lat. 1. ft|. Silvery, 



blackish on the back ; a blackish opercular spot ; fins greyish, 

 immaculate. 



Total length 240 millim. 



Lake Nyassa and Upper Shire Eiver. 



Three of the " Chromis " described by Castelnau from Lake 

 Ngami very probably belong to this genus and appear to be based 

 on individual variations of a single species : — 



Pabatilapia thtjmbebgii. 



Chromys ilmmhergi, Castelnau, Poiss. Afr. Austr. p. 13 (1861). 

 Chromys ngamensis, Casteln. 1. c. 

 Oliromys livingstotiii, Casteln. 1. c. 



Teeth in 3 or 4 series. Body rather elongate. Dorsal XVII 

 13-14. Anal III 9. Golden, dark green, or blackish, with or 



