180 
Annals of the Transvaal Museum. 
Proplenrae almost smooth, the apex stoutly striated, the striated band 
narrowed above. Mesopleurae closely punctured at the base above, the 
apex smooth, narrowly above, widely below, the rest irregularly striated. 
Metapleurae closely, rather strongly punctured. Base of first abdominal 
segment aciculated, the apex with a broad band of curved striae on either 
side ; the basal half of the second segment more strongly and regularly 
striated ; the other segments smooth. 
PIMPLINAE. 
Acoenitini. 
Acronus melanarius, sp. n. 
Black ; the sides of the clypeus broadly above to the commencement 
of the rounded apex, the mandibles except the teeth, and the apical seven 
or eight joints of the antennae, rufous ; wings, fuscous violaceous, highly 
iridescent, the nervures and stigma black. Antennae as long as the 
abdomen and longer than the head and thorax united, thirty- join ted, 
the pubescence microscopic, the third joint a little longer than the fourth. 
Transverse median nervure interstitial ; the disco-cubital broken by a 
distinct stump, the recurrent nervure with two bullae and received one- 
third of its length beyond the transverse cubital ; the transverse cubital 
nervure in hind wings broken near the bottom. Pubescence on metanotum 
dense, moderately long, black ; on the rest of the body it is sparse, except 
on the base of the abdomen. Male. 
Length, 25 mm. ; wing stretch, 57 mm. 
Waterval (Zoutpansberg District). November. 
Head finely, closely punctured ; a fine keel between the antennae, a 
broader, rounded one down the middle of the face, not reaching to its apex ; 
it is separated from the clypeus by a wide, not very clearly defined, furrow, 
which is wider and deeper on the sides. Apex of clypeus broadly rounded. 
The curved mandibles have the basal part striated, the striae becoming 
gradually stronger. Malar space half the length of the eyes. Apex of 
clypeus broadly rounded. Hinder ocelli separated from each other by 
half the distance they are from the eyes. Upper part of thorax opaque, 
alutaceous, the pleurae finely, closely punctured ; metanotum with two 
irregular keels down the middle, the sides bordered by a more distinct 
one ; the apical slope bordered by keels all round, the keels forming a 
closed area, roundly narrowed at the top, the upper keel waved ; on either 
side of this is another area, three times wider than long, commencing near 
the middle of the central area ; it is transverse at the apex and wider 
than long. Abdomen alutaceous ; on the sides of the basal segment is a 
keel, which curves round the inner side of the spiracles at the base. The 
head is not so wide as the thorax ; the temples are broadly, roundly 
dilated. 
Allied to A. niger , Enderl. 
