494 Transactions South African Philosophical Society, [vol. xiii. 



Gen. MACROMA, Gor. and Perch., 

 Monogr. d. Cet., 1833, p. 35. 



Mentum parallel, ligular part ampliated with the outer face greatly 

 swollen in the centre and sloping thence to the anterior margin 

 which is deeply emarginate, crescent-shaped {cognata), slightly 

 sinuate (emarginicollis), or entire (lutescens), maxillae long, robust, 

 upper lobe armed with a strong, sharply arcuate tooth, inner lobe 

 with a similar but shorter tooth, last joint of labial and maxillary 

 palps long, cylindrical, the former curved ; head simple, eyes very 

 large, the canthus short ; basal joint of antennae well developed, 

 triangular, compressed laterally ; prothorax sub-trapezoidal ; scutel- 

 ium sharply triangular ; elytra broader than the prothorax, strongly 

 emarginate laterally below the shoulder, and straight, or nearly so, 

 thence to the apex, plane, non-costulate, and sloping in the posterior 

 part ; spiracle of the propygidium sharp or not ; pygidium sloping 

 more or less, sub-acuminate, carinate in the centre, and bi-tuber- 

 culate, or simple ; intermediate coxae separated by a broad horizontal 

 process projecting beyond them and bluntly arcuate at apex ; pro- 

 sternum simple ; anterior tibiae bi-dentate outwardly, intermediate 

 and posterior ones with a spine on the upper edge ; tarsal joints 

 somewhat compressed, sub-cylindrical on the upper side, claws long. 



The genus is represented in Africa and Asia. 



Key to the Species. 



A 2 . Clypeus attenuate, anterior margin reflexed in the centre. 



B 2 . Tooth of inner maxillary lobe trifid. 



C 2 . Prothorax deeply impressed longitudinally in the 

 posterior part ; scutellum deeply sunk ; elytra 

 concolorous cognata. 



A 1 . Clypeus simple. 



B 1 . Tooth of inner maxillary lobe simple. 



C 1 . Prothorax not impressed longitudinally in the 

 posterior part. 



Clypeus slightly sinuate in front. 



Prothorax black, not sulcate ; elytra with a broad 

 flavescent supra-marginal, arcuate patch ; pygidium 

 carinate and bi-tuberculate cmargimcolhs. 



Clypeus oval, entire in front ; prothorax sulcate 

 longitudinally, luteous-fulvous with two chestnut 

 bands ; elytra of the same colour as the prothorax 

 and with one humeral spot and two sub-apical 

 transverse chestnut macules ; pygidium simple . . luteaccna. 



