10 MR. G. A. BOULENGEE ON A COLLECTION 



The genus Lamprologus was known from a single species L. congoensis Schilthuis, 

 discovered a few years ago in the Congo. The species now described raise the number 

 to 7, distinguishable by means of the following key : — 



I. Cauda] rounded or truncate. 



A. Anal with 10 spines. 



D. XIX 8 ; Sc. 46 TT^; depth of body 4 times in total length 1. L.fasciatus. 



D- XX-XXI 6 ; Sc. 32-33 -^ ; depth of body 2f to 2f times in total length. 2. L. compressiceps. 



B. Anal with 6 to 8 spines. 



D. XIX-XX 8-9; Sc. 33-35 ^^ ; depth of body 2^ times in total length . 3. L. moorii. 



D. XVIII-XIX 8-10 ; Sc. 42-53 —^ ; depth of body 3| to 4 times in total length. 



4. L. congoensis. 



C. Anal with 5 spines. 



D. XX 8-9 ; Sc. 36-40 ^^ ; depth of body 3.^ to 3| times in total length . 5. L. modestus. 



D. XVIII 10-11 ; Sc. 90-95 g^; depth of body 4 times in total length . 6. L. elongatus. 



II. Caudal deeply notched, crescentic. 



D. XX-XXI 7-8 ; A. VI-VII 6 ; Sc. 50-54 J^ 7 . L. furcifer. 



Telmatocheomis, g. n. 



Body more or less elongate ; scales ctenoid. Jaws with a series of conical teeth, 

 followed by a broad band of minute tricuspid teeth; lateral teeth small, conical. 

 Maxillary exposed. Dorsal with 20 to 22 spines, anal with 6 or 7. Vertebree 33 

 (16+17). 



This genus is closely allied to Lamprologus, differing in the small teeth forming a 

 band behind the outer row being tricuspid instead of conical. It therefore stands 

 somewhat in the same relation to Lamj^rologiis as Tilapia does to Paratilapia. 



8. Telmatocheomis vittatus, sp. n. (Plate II. fig. 2.) 



12 to 16 enlarged conical teeth, tipped with brown, in the outer row in each iaw. 

 Depth of body 4^ to 4f times in total length, length of head 4. Snout descending in 

 a strong curve, as long as or a little longer than the diameter of the eye, which is 

 3f to 4 times in length of head and equals interorbital width ; maxillary extending to 

 below the nostril ; head naked, opercle with a few deciduous scales. Gill-rakers very 

 short and tew. Dorsal XXI-XXII 8 ; spines increasing in length to the last, which 

 equals ^ length of head : soft rays a little longer. Pectoral f length of head. Ventral 

 produced into a short filament, reaching origin of anal. Anal VII 5-6; spines 

 increasing in length to the last, which equals last dorsal. Caudal rounded. Caudal 

 peduncle as long as deep. Scales 45-52 ~ ; lat. 1. g=g. Yellowish, with a dark 



