138 MB. a. A. BOULENGEB ON THE AFlllCAN AND [Teb. 7, 



pointed, | length of head, not extending to origin of anal. 

 Ventral reaching vent. Anal III 6 ; third spine as long as 

 longest dorsals. Caudal truncate, deusel}' scaled. Caudal peduncle 

 a little longer than deep. Scales with finely denticulate border, 

 34 "^ ; lat. 1. ^r'. Bright golden yellow, with three black stripes, 

 one along the side oi: the body from the eye to the base of the 

 caudal, a second above the upper lateral line from the occiput to 

 the caudal peduncle, and a third along the dorsal fin ; two curved 

 black bands across the snout from eye to eye ; a few black spots 

 on the upper part of the caudal fin. 



Total length 75 millim. 



Lake Nyassa. 



59. TiLAPIA OLIGACANTHUS. 



Tilapia oUq acanthus, Bleek. Versl. Ak. Amsterd. ii. 1868, p. 309 ; 

 Bleek. & Pollen, Poiss. Madag. p. 11, pi. iv. fig. 1 (1874). 



Pli/chochromis oligacantJms, Steind. Sitzb. Ak. Wien, Ixxxii. i. 

 1880, p. 249, pi. i. ; Sauvage, Hist. Madag., Poiss. p. 439, 

 pis. xliv. fig. 4, xlivB. fig. 1, & xlv. fig. 1 (1891). 



Teeth in 3 series in both jaws, of outer row moderate, of inner 

 rows very small. Depth of body 2i- to 2^ in total length, length 

 of head 2| to 3. Snout with straight or slightly convex upper 

 profile, 14^ diameter of eye, which is 3| to 4 times in length of 

 head and equals intei'orbital width ; mouth moderate, | diameter of 

 eye, extending to between nostril and eye ; 4 or 5 series of scales 

 on the cheek ; larger scales on the opercle. Grill-rakers short, 12 

 or 13 on lower part of anterior arch. Dorsal XIII-XIV 11-12 ; 

 last spine longest, f to 5 length of head, | to | longest soft rays. 

 Pectoral poiuted, as long as the head or a little shorter, not 

 extending so far as origin of anal. Ventral reaching vent or a 

 little beyond. Anal III 8-9 ; third spine longer than last dorsal. 

 Caudal with rather deep crescentic emargination. Caudal peduncle 

 as long as deep. Scales with finely denticulate border, 32-34 

 ll^ ; lat. 1. |i^. Olive or brownish above, with five dark bars or 

 two or three large dark spots on each side. 



Total length 135 millim. 



Madagascar. 



60. Tilapia madagascariensis. 



PtychocJiromis madag ascarietisis, Sauvage, Hist. Madag., Poiss. 

 p. 442, pis. xliii. fig. 4 & xhv a. fig. 6 (1891). 



Teeth in 4 or 5 closely-set series, of outer row moderate, of 

 inner rows very small. Depth of body 2 to 24- in total length, 

 length of head 3. Snout with straight or slightly convex upper 

 profile, 1| to 1| diameter of eye, which is 4 times in length of 

 head and I5 to I5 in interorbital width; mouth moderate, 

 I diameter of eye, extending to between nostril and eye ; 4 or 5 

 series of scales on the cheek ; larger scales on the opercle. Grill- 

 rakers short, falciform, 12 on lower part oF anterior arch. Dorsal 

 XIII 10-13 ; last spine longest, g to f length of head ; middle 



