1904. | Catalogue of the Coleoptera of South Africa. 59 
The characters distinguishing this genus from Tvochalus are the 
presence of a strong, hind ocular keel which either unites in a straight 
line with the genal canthus or is not quite connected with it, in 
which case it is slightly higher than the genal keel, and the presence 
of a transverse clypeal keel edging the usually deeply depressed 
anterior part of the clypeus the lateral margins of which are always 
continued as far as the sharp apical angle instead of being produced 
into a more or less sinuate keel above the margin of the anterior 
part. 
The uniformity in facies and the enormous variation in colour 
makes the study of the species a most difficult one, but the shape of 
the genital armature helps greatly in the identification ; these arma- 
tures are, however, so very complicated that it is difficult to give a 
good description of them, and I greatly regret that I could not have 
them figured; the presence or absence of an additional antennal 
joint helps also in grouping species which but for that character 
would be hardly distinguishable. Cf. A. ditissimus and A. pavonimus 
with A. crassus, &e. 
The distribution of species in South Africa is as wide as in the 
genus T’rochalus. 
Key to the Species. 
A?. Antenne 10-jointed. 
B?. Hind ocular keel meeting the edge of the genal canthus. 
a. Clypeal transverse keel not reaching the sides. 
Antennal joints of male free, clypeal keel very short... @neus. 
a‘. Clypeal transverse keel reaching from side to side. 
Clypeus strongly constricted laterally and tri-dentate. 
b?, Anterior tibiz bi-dentate. 
Elytra deeply striate on the dorsal part.. .. .. .. ditissimus. 
Elytra slightly striate in the dorsal part os +e ee ©6pavoninis. 
bt, Anterior tibiz tri-dentate. 
Bronze-black, with the upper side fleshy red So 80 GRORETES 
Bronze-black, with a broad discoidal red band on each 
ClyiROM Mee eet sare acne Ae), eat ee ear wae ae  PUPOUALLaIUS. 
Bt. Hind ocular keel not meeting quite the genal canthus. 
a?, Clypeus strongly constricted laterally and tri-dentate in 
front. 
b?, Frontal suture grooved. 
