Annals of the Transvaal Museum. 
153 
more closely transversely striated ;. the triangular part separating the 
basal furrows is prolonged as a stout keel down the basal half of the apical 
furrow ; the rest of the basal part of the base is coarsely alutaceous, almost 
punctured, the apex irregularly, transversely striated; the apical slope 
is more strongly, transversely striated; the metapleurae closely, rather 
finely striated ; head, pro- and mesothorax closely, distinctly punctured ; 
the clypeus more finely than the front, its apex smooth and shining, broadly 
rounded ; the hinder ocelli are separated from each other by a less distance 
than they are from the anterior ; mandibles with a red band near the 
middle ; the third and fourth joints of the antennae are equal in length ; 
the abdomen is more finely and more closely punctured than the thorax ; 
the basal segments more distinctly than the apical. Male. 
Length, 7 mm. 
Pretoria. July and November. 
In one example the first recurrent nervure is received in the apex of 
the first cubital cellule. 
This species may be known from the others known to me from the 
Cape by the apex of the clypeus being broadly rounded, not pointed or 
toothed. 
Pison denticeps, sp. n. 
Black; covered with silvery pubescence; the apex of the clypeus 
with a distinct triangular tooth in the middle ; wings hyaline, the nervures 
black ; the first transverse cubital nervure roundly oblique ; the short 
second either entirely obliterated or indicated by a stump in front ; the 
first recurrent nervure received in the apex of the first cubital cellule ; 
the second interstitial broadly, roundly curved ; the second abscissa 
of the radius about one-fourth of the length of the first ; the metanotum 
has on either side of the base a strongly crenulated furrow, narrowed 
outwardly; the longitudinal furrow is wide, longish triangular, finely, 
closely, obliquely striated, and with a fine keel down the middle; the 
apical slope is more strongly, transversely striated ; the sides bordering 
the basal furrow are finely, closely, rugosely punctured and irregularly 
striated, especially on the basal half ; metapleurae finely, closely striated, 
the striae rounded at the base ; head, pro- and mesothorax finely, closely 
punctured ; the base of the abdomen is finely, closely punctured. Male. 
Length, 5 mm. 
Transvaal. 
The third and fourth joints of the antennae are equal in length ; the 
spurs are fuscous, at least at the base. 
Pison clypeatus, sp. n. 
Black ; covered with silvery pubescence ; the apical three or four 
joints of the tarsi rufo-testaceous ; the tegulae fuscous ; wings hyaline ; 
the stigma and nervures black ; the pedicle of the second cubital cellule 
shorter than the nervures, which are roundly curved, the first a little 
longer than the second ; the cellule is moderately large and is longer along 
the transverse cubitals than along the cubitus ; the first recurrent nervure 
is received very shortly before the transverse cubital ; the second is 
interstitial and broadly, roundly curved ; the first abscissa of the radius 
6 
