152 
Annals of the Transvaal Museum. 
the apical slope, irregularly reticulated, the central and basal reticulations 
larger than the others; the apical slope opaque, surrounded by a stout 
keel, which forms a semicircular area ; abdominal petiole stout, as long as 
the dilated apical part of the segment, along the ventral part of which it 
is continued as a stout keel ; base of thorax transverse, stoutly keeled, 
the keel clearly separated behind ; ocelli in a curve, the hinder separated 
from each other by double the distance they are from the eyes. Female. 
Length, 4*5 mm. 
The first transverse cubital nervure is obliquely sloped, a little rounded ; 
the second is roundly curved outwardly ; the second recurrent nervure 
is received near the middle of the cellule. Parapsidal furrows complete. 
Trypoxylon Latr. 
Trypoxylon lissonotum, sp. n. 
Black; smooth, shining, the head, thorax, and femora covered with 
long, white pubescence ; the face and elypeus densely with depressed 
silvery pile ; wings hyaline, the nervures black ; base of metanotum bare, 
smooth, and shining; from its outer edge run two oblique keels, which 
unite at the apex, forming a longish triangular area ; a wide, smooth, not 
very deep, furrow commences at the end of the smooth part ; from the 
outerside of the triangular area runs a shallow oblique furrow, with some 
transverse keels, the two not uniting at the apex ; the space enclosed by 
them is irregularly, not very strongly, striated ; the apical slope is opaque, 
deeply, widely furrowed, the furrow widest above ; the sides are irregularly, 
obliquely striated ; metapleurae with a smooth, shallow furrow below ; 
above this it is somewhat strongly, closely, obliquely striated, the striae 
more or less intertwining ; upper half of front with distinct, shallow* round, 
clearly separated punctures, this part having a shallow furrow down the 
centre ; first abdominal segment as long as the thorax and not much shorter 
than the following three segments united. Female. 
Length, 10 mm. 
Pretoria. April. 
Palpi blackish, fus ous towards the apex ; the apex of the cubitus is 
roundly curved downwards ; the recurrent nervure being received at the 
base of this curve ; calcaria black. 
Pison Spin. 
Pison transvaalensis , sp. n. 
Black ; covered with silvery pubescence, dense on the elypeus and 
forming bands on the apices of the abdominal segments ; wings hyaline, 
the nervures black ; the second cubital cellule triangular ; the pedicle 
slightly longer than the lower branches ; the first broadly rounded ; the 
second straight, oblique ; the first recurrent nervure received shortly 
beyond the first transverse cubital ; the second interstitial ; the second 
abscissa of radius one-fourth of the length of the first ; the first and second 
united are hardly so long as the third ; the metanotal furrow with the 
basal and apical branches wide, the latter extending to the apex ; the 
basal branches strongly, the apical not quite so strongly, distinctly, and 
