76 Transactions South African Philosophical Society. [vou. xt. 
towards the anterior part the angles of which are broadly rounded, 
and the anterior margin broadly arcuate, the outer face is very slightly 
convex in the median part, and the whole ligular part depressed; the 
labial palpi are inserted into a deep lateral condyle at some distance 
from the anterior angles, and the last joint is somewhat broadly 
fusiform at the base; jaws robust, and with a double row of three 
or four teeth set opposite each other in three tiers, the lower one 
being more or less distinctly trifid, these teeth are set at right angles 
to the inner edge of the maxilla which are truncate at the tip with 
the outer angle sharp; last joint of maxillary palps flail-like, longer 
than all the joints taken together; antenne 10-jointed with the club 
elongate and 5- or 6-jointed in the male according to the development 
of the last joint of the pedicel, or plainly 7-jointed; ovate and 5- or 
6-jointed in the femaie, but with the last joint of the pedicel more or 
less sharply acuminate; clypeus narrowed laterally diagonally from 
the narrow canthus of the eyes towards the anterior angle which is 
never blunt, and is occasionally very sharp, and even projecting, and 
slightly emarginate laterally near the anterior part, or deeply sinuate ; 
the anterior margin is more or less deeply sinuate, the margin itself 
being always reflexed, and when it is very highly raised there is a 
faintly impressed line along the narrow, seemingly depressed part, 
but there is no suture in the median part,* and the clypeal suture at 
the junction with the head is straight, in some species the anterior 
margin is bi-sinuate, and in one (A. rufa) there is a somewhat 
distinct, longitudinal keel in the middle of the anterior part; pro- 
thorax convex, almost twice as broad as long, ampliated laterally 
in the centre with the anterior angles sharp and the posterior 
rounded, fringed laterally by more or less dense hairs, and having 
also a few hairs along the outer part of the anterior margin; scu- 
tellum cordate or ogival; elytra somewhat ampliated and convex in 
the posterior part, or sub-cylindrical, without any distinct dorsal 
costules, and covering the rather broad propygidium; pygidium 
convex ; abdominal segments divided by deep sutures, but seemingly 
fused, somewhat pubescent, pectus moderately pubescent; anterior 
tibiz bi-dentate outwardly and having a very long inner spur which 
in some species curves conspicuously outwardly in the male 
(A. amoena, fuscipennis) but shows also a tendency to curving in 
the other species—in the female, however, this spur is straight; 
tarsi long, slender, claws more or less slender, divaricating, more 
or less plainly cleft diagonally but not deeply underneath in the 
anterior part; in some species only the inner claw of the anterior 
tarsi is cleft; posterior cox moderately robust, posterior tibia 
* In A. pilosula there is, however, a faint, median, interrupted line. 
