HEMICHEOMIS. 



461 



1. HEMICHEOMIS. 



Peters, Mon. Berl. Ac. 1857, p. 403 ; Boulenger, Proc. Zool. Soc. 1898, p. 134, and Poiss. Bass. 

 Congo, p. 409 (1901) ; Pellegrin, Mem. Soc. Zool. France, xvi. 1904, 

 p. 252. 



Teeth conical, in one series, or with one, very rarely two, 

 series of a few very small teeth behind the outer; the 

 two median outer teeth often larger than the others *. 

 Maxillary bone exposed at the end when the mouth is closed. 

 Body short or moderately elongate ; scales cycloid ; two 

 lateral lines. Dorsal fin with 13 to 15 spines, anal with 3. 

 Vertebra 26-28 (14-15 + 12-13). 



This genus comprises three or four species from Africa, 

 one of which occurs in the Nile and has a wide distribution 



Dentition of . . . 



Hemicliromis bimaculatus. in North aIld Tropical Africa. 



V 



1. HEMICHROMIS BIMACULATUS. 

 (Plate LXXXVI. fig. 1.) 



Gill, Proc. Ac. Philad. 1862, p. 137 ; Giinther, Cat. Fish. iv. p. 275 (1862) ; Steindachner, Sitzb. 



Ak. Wien, lx. i. 1870, p. 972, pi. i. fig. 5; Sauvage, N. Arch. Mus. (2) iii. 1880, p. 35, pi. ii. 



fig. 1 ; Steindachner, Notes Leyd. Mus. xvi. 1894, p. 49 ; Giinther, Ann. & Mag. N. H. (6) 



xvii. 1896, p. 272 ; Boulenger, Proc. Zool. Soc. 1898, p. 135, and Poiss. Bass. Congo, p. 411 



(1901) ; Pellegrin, Mem. Soc. Zool. France, xvi. 1904, p. 255. 

 llemichromis guttatus, Giinther, Cat. t. c. p. 275. 



llemichromis letourneuxii, Sauvage, Bull. Soc. Philora. (7) iv. 1880, p. 212. 

 llemichromis saharce, Sauvage, t. c. p. 226 ; Holland, Rev. Scientif. (4) ii. 1904, p. 418, fig. 

 Hemichromis rolandi, Sauvage, op. cit. v. 1881, p. 103 ; Holland, 1. c. 



Depth of body twice and one-third to three times in the total length, length of head 

 twice and four-fifths to three and one-sixth times. Snout with straight or convex 

 upper profile, as long as or a little longer than the eye (shorter in the very young), the 

 diameter of which is contained twice and a half (young) to four times in the length of 



* Not or hardly noticeable in many specimens of H. bimaculatus, which may be regarded as a connecting- 

 ink between the type species of Hemichromis (H. fasciatus, Veters) and ParatUapia. 



