1904. | Catalogue of the Coleoptera of South Africa. 3 
such important characters as the shape of the clypeus and the pre- 
sence or absence of a posterior eye-keel, we find elongated species 
with a very strongly constricted clypeus and no posterior eye-keel 
(Arraphytarsa, Allokotarsa, &c.), and very short and convex species 
without constricted clypeus and with a posterior eye-keel (Dolero- 
serica). Some species of this genus have even the silky sheen of 
Serica, which is replaced by an opaline sheen in Trochalus. 
The number of antennal joints is either 9 or 10; that of the club 
is from 3 to 5 in the male (South African species) and of 3 in the 
female, except in Microtrachelus, where it is 4; this club is as long 
or longer than the pedicel in the male; the claws are cleft, the 
superior tooth being usually longer and more slender than the 
lower, which is often stouter in the male than in the female, often 
membranous or lobe-like, and in some genera, such as Hwronycha, 
Allokotarsa, Allogistotarsa, these claws and also the tarsal joints are 
most abnormal. I have not met with this peculiarity in the short, 
spherical, or very convex species. 
Some of the genera are very closely allied, others offer good dis- 
tinctive characters in the male only, in which case the females are 
very much alike. An examination of the genital armature of the 
male is as necessary for the division of species as in the RUTELINE 
or MELOLONTHIN#. 
The species known to me are generally met with in somewhat 
sandy spots, either at dusk or if the sky is overcast. Only a few 
species occur in the south-western part of the Cape Colony; they 
seem also to be rare in the eastern provinces of that part of South 
Africa, becoming more numerous, however, as Natal is reached, and 
are very abundant in the North-Eastern Transvaal, Rhodesia, and 
Ovampoland. Many of the species range from Natal to Mossamedes. 
Key to the Genera. 
A’, Eyes divided in front by the genal canthus, and having no 
posterior keel. 
B?. Clypeus not constricted laterally, nor tri-dentate in front. 
C3. Body elongated or slightly elongato-ovate, moderately 
convex. 
D?. Prosternum with an aculeate process. 
Autenne 10-jointed ; club of male 6-jointed .. Pleophylla, 
D‘. Prosternum without an aculeate process. 
E?. Head with a frontal suture only. 
F?, Antenne 10-jointed (normally). 
