134 mr. g. a. boulenger on the african and [mar. 1, 



1. Lamprologus. 



Lamprolofjus, Schilthuis, Tijdschr. Nederl. Dierk. Yer. (2) iii. 

 1891, p. 85. 



Body rather elongate ; scales ctenoid. Jaws with a band of 

 very small conical teeth, with enlarged canines in front. Maxil- 

 lary exposed. Dorsal with 18 or 19 spines, anal with 6 or 7. 

 Vekebi-feSl (15 + 1(5). 



A single species, from the Congo. 



This genus is easily distinguished from other African forms by 

 the number of anal spines ; from the American Heros by the 

 maxillary not being entirely concealed when the mouth is closed ; 

 from Etrojdus and Paretroplus by the dorsal not folding in a scaly 

 sheath, and by the dentition. 



1. Lamprologus congoensis. 



Lamprologus congoensis, Schilthuis, 1. c. pi. vi. fig. 1. 



Depth of body 3f to 4 times in total length, length of head 

 3 to 3|. Snout a little longer than diameter of eye, which is 3^ 

 to 4 times in length of head, and equals or slightly exceeds inter- 

 orbital width ; maxillary extending to below anterior border of 

 eye ; head naked, or with a few isolated scales on the opercle. 

 Gill-rakers short, 9 or 10 on lower part of anterior arch. Dorsal 

 XVIII-XIX 8-10 ; spines increasing in length to the last, which 

 measures f length of head and k longest soft rays. Pectoral | to 

 I length of head. Ventral reaching vent or origin of anal. Anal 

 VI-VII 5-6. Caudal rounded, subaciiminate. Caudal peduncle 

 as long as deep. Scales 42-53 j|^ ; lat. 1. ^Ij. Brownish or 

 olive, uniform or with four or five rather indistinct darker cross- 

 bars ; a dark streak behind the eye, and a blackish opercular spot; 

 vertical fins grey, uniform or with small lighter and dai'ker spots. 



Total length 100 millim. 



Upper and Lower Congo. 



2. Hemic'heomis. 



Hemichromis, Peters, Mon. Berl. Ac. 1857, p. 403 ; Giinther, 

 Cat. iv. p. 274 (1862). 



ChromicJithi/s, Guichenot, in A. Dumeril, Arch. Mus. x. 18o9 

 p. 257. 



Hemichromis, part., Pfeffer, Thierw. O.-Afi*., Pische, p. 19 

 (1896). 



Body short or moderately elongate; scales cycloid. One or 

 two series of conical teeth in the jaws, the second series, if present, 

 short and consisting of a few vei'y small teeth ; the two middle 

 teeth in the ja\vs larger than the others, in the adult at least. 

 Maxillaiy exposed. Dorsal with 13 to 15 spines, anal with 3. 

 Vertebrae 26-28 (15 + 13 in H.fasciatm, 14-|-12in H. himacidatus). 



North and West Africa, 



