•190 Transaction* Smith African Philosophical Society, vol. xiii 



median part, is moderately large and sub-ovate, the third and apical 

 one is small, transverse, narrower inwardly; pygidium with two 

 snow-white macules ; pectus having on each side a sub-rotund, 

 whitish macule. 



Length 10-11 mm. ; width 6-6^ mm. 



Hah. Neighbourhood of Lake N'Gami. 



Size and appearance almost like that of L. hamorhoidalis. Near 

 M. amabiUs in colouration, smaller, narrower, and easily distinguished 

 by the snowy-white macules of elytra, which are of a different shape 

 and differently distributed." 



Tribe CKEMASTOCHILIDES. 



In this Tribe the head is more retractable than in the other groups 

 of the Cetonince ; the clypeus is always deflexed, with the frontal 

 part very often convex, and the sides vertical, the apical margin, 

 when the head is drawn in, fits against a long ante-coxal prostemal 

 spine, or, when this spine is rudimentary, against the anterior coxae, 

 and as the apical part of the pronotum is quite vertical laterally, the 

 clypeus fitting against the margin obturates completely the lower 

 side ; this peculiarity is not, however, so marked in Maeroma or 

 Phymatopteryx, which are flower-haunting insects, as in the others 

 which are myrmecobious or termitobious. The shape of the 

 mentum is very variable and often extremely singular. The outer 

 face shows always a tendency to get thicker either in the centre or 

 towards the apical part of the ligula, which is often excavated or 

 cupuliform, while the centre is also often gibbose or very convex and 

 even tuberculate (Genuchus). In some genera the whole mentum 

 is plane, or in the shape of a shield, pointed at the base (Scaptobius, 

 Placodidus, Anatonocliilus), in which case the labial palpi are 

 styliform, fits closely against the sides, and do not project beyond 

 the apex, while they are sub-cylindrical and project beyond the apex 

 in the other genera ; the eyes are broad and large in some species, 

 depressed on the upper side in others, and divided by a hairy 

 canthus ; the antennae are short, and the club large, the basal joint 

 is strongly compressed and broadly triangular, often auriculiform, 

 and when the head is contracted this joint fills the broad incision 

 of the clypeus in front of the eye ; both the lobes of the maxillae are 

 sharply dentate, and the teeth are often falciform ; the thorax is 

 variable in shape, but seldom sub-trapezoidal {Maeroma, Hoplostomus) ; 

 the scutelhun is Bharpl) triangular; the elytra elongated, strongly 

 sinuated laterally, never covering completely the propygidium the 



