114 MR. G. A. BOTJLEyGEK ON THE AFRICAN .AJfD [Feb. 7, 



cycloid, 31-34 ?^ ; lat. 1. i|^^. Brownish or olive, uniform or 

 with darker spots at the bases of the scales : young with more or 

 less distinct dark bars on the body, oblique streaks on the soft 

 dorsal and anal, and two or three bars across the caudal ; opercular 

 spot usually very indistinct. 



Total length 180 millim. 



East and South-east Africa, from the coast of Zanzibar to 

 Natal. 



8. TiLAPIA GALIL.EA. 



Sjjarus gdlilceus, Artedi, in Hasselq. Eeise Falsest, p. 389 (1762). 



C'hromis '1 gnlilceus, Giinth. Cat. iv. p. 273 (1859). 



Chromis niloticus part., Giinth. 1. c. p. 267, and Proc. Zool. Soc. 

 1864, p. 490, and in Petherick, Trav. C. Afr. ii. p. 216 (1869); 

 Steind. Sitz. Ak. Wien, Ix. 1870, p. 964, pi. iv. fig. 1. 



Chromis niloticus, Steind. Verb. zool. -hot. Ges. Wien, xiv. 1864, 

 p. 226 ; Tristram, Paun. Palest, pi. xviii. fig. 1 (1884). 



Chromis tiberiadis, Lortet, Ann. Mus. Lyon, iii. 1883, p. 135, 

 pi. vi. 



Chromis microstomus, Lortet, 1. c. p. 139, pi. A'iii. fis. 1. 



Teeth very small, in 4 to 6 series in both jaws. Depth of body 

 2 to 2\ times in total length, length of head 2| to 3 times. Snout 

 with straight or convex upper prolile, 1\ to 1| diameter of eye, 

 which is 4 to 5 times in length of head and Ij to 2 in inter- 

 orbital width ; mouth narrow, not more than | width of head, 

 extending to below the nostril ; 2 or 3 series of scales on the 

 cheek, forming a narrow oblique band which in its widest part 

 does not exceed the width of the naked praeopercle ; large scales 

 on the opercle. Gill-rakers short, 20 to 2b on lower part of 

 anterior arch. Dorsal XVI-XVII 12-14 ; last spine longest, h to 

 I length of head, | to § longest soft rays. Pectoral falciform, 1^ 

 to If length of head, extending to origin of anal or beyond. 

 Ventral reaching vent or origin of anal. Anal III 10-11; third 

 spine as long as or a little shorter and stronger than last dorsal 

 spine. Caudal truncate or sUghtly notched. Caudal peduncle 

 deeper than long. Scales cycloid, 31-34 jj^ ; lat. 1. ^||. Brown- 

 ish or olive, without spots or bars ; a more or less distinct dark 

 opercular spot ; vertical tins grevish or brown, without markings. 



Total length 300 millim. 



Lake of Galilee and Jordan, Nile, Senegal, Xiger. 



9. TiLAPIA MICEOCEPHALA. 



Chromis microceijhalus (Bleek.), Gduth. Cat. iv. p. 272 (1862). 



Melcmogenes mierocejthalus, Bleek. Nat. Verb. A'et, Haarlem, 

 xviii. 1863, no. 2, p. 37, pi. vi. fig. 1. 



Teeth very small, closely set, in 4 or 5 series in both jaws. 

 Depth of body 2 to 24 times in total length, length of head 24 to 

 3 times. Snout with straight or convex upper profile, 1| to 1:^ 

 diameter of eye, which is 3| to 4 times in length of head and Ij 



