1904. | Catalogue of the Coleoptera of South Africa. 265 
the clypeus, which is shorter, has strongly reflexed margins, and is 
deeply emarginate in the centre; prothorax slightly sinuate in the 
anterior part, ampliated laterally at about the median, somewhat 
moderately convex, covered with very closely set, deep, round 
punctures which are separated from each other by a space narrower 
than their own diameter, the outer margin is reflexed and strongly 
serrate from the anterior angle to the median part, but carinate 
thence to the sharp basal angle, and the anterior is briefly hairy in 
the centre; scutellum ogival, somewhat short, closely and deeply 
punctate; elytra ampliated laterally from about the median part, 
not very convex, somewhat retuse behind, plainly tri-costate on 
each side and with the suture also plainly raised, the whole surface 
is covered with nearly confluent, deep punctures, giving to the elytra 
a very coriaceous appearance; propygidium and pygidium very 
closely punctured, the latter somewhat convex, glabrous along the 
edges except for a few short sete at the apex; abdomen closely 
punctulate, glabrous. 
Length 18-20 mm. ; width 94-11 mm. 
The genital armature of the male is strikingly different from that 
of any of the South African Melolonthine. 
Hab. Southern Rhodesia (Sebakwe). 
Gen. PSILONYCHUS, Burm., 
Handb. d. Entom., iv., 2, p. 288. 
Mentum quadrate, entirely fused with the ligular part, which is, 
however, so reduced in length that the labial palpi are inserted on 
the angles of the anterior part, which is straight, not emarginate ; 
second joint of the labial palpi thick, last joint short, ovate, but 
sub-acuminate at tip; maxille robust and with a quadrifid, strong 
tooth at the tip and two simple teeth underneath, maxillary palpi 
moderately long, last joint fusiform, not impressed laterally ; 
mandibles very robust, arcuate ; labrum vertical, not deeply emar- 
ginate, head small, narrower than the clypeus and without a clypeal 
suture, or with only a faint one, clypeus more or less deeply 
emarginate in the centre and with the margins slightly reflexed ; 
eyes moderately large; antenne 9- or 10-jointed, club usually tri- 
jointed, but occasionally 4-jointed, long in the male, ovate in the 
female, the two last joints of the pedicel more or less compressed ; 
prothorax moderately convex, either sub-aculeate or ampliated 
laterally in the middle according to the sexes, and equally attenuated 
thence towards the sharp anterior angle as it is towards the base 
the angle of which is not much pronounced, in the centre is a more 
