Annals of the Teansvaal Museum. 
177 
near which, is a broad white ring. Legs slender, the fore tibiae more than 
twice the length of the tibiae. Claws short. Metaplenral keel complete, 
stout. Head wider than the thorax. 
The type of this genus is a slender, uniformly luteous species, with 
clear hyaline wings. I refer it to the Mesostenini from the form of the 
areolet, which, although larger than is usual with that tribe, has the second 
nervure faint and it is not narrowed in front as it is in the Cryptini. There 
• is no described genus with which it can be compared. Characteristic is the 
face with the sides deeply furrowed and the depressed clypeus. 
Alriada spilocephala, sp. n. 
Luteous, the flagellum of antennae, except the apex of the tenth and 
the eleventh to seventeenth joints which are clear white ; a mark on the 
centre of the vertex and upper half of the front, the mark narrowly dilated 
for a short distance along the keel on occiput and roundly narrowed below, 
the apex of mandibles and the apical fourth of the ovipositor, black. 
Wings hyaline, the stigma and nervures black, the second transverse 
cubital nervure and the disco-cubital nervure beyond the middle bul- 
lated. Female. 
Length, 7 mm. ; terebra, 3 mm. 
Smooth and shining, the second and third abdominal segments closely, 
rather strongly, the fourth weakly, punctured. There is a short, sparse, 
white pubescence. 
Mesostenus albilabris, sp. n. 
Black, shining ; the thorax red, the lower part of the propleurae, 
prosternum, the centre of mesosternum, a triangular mark along the apex 
of the furrow and the metasternum, black ; the apical half of the eighth 
and the ninth to fourteenth joints of the antennae and the labrum, white ; 
the clypeus tinged with brown, the palpi blackish-fuscous, the middle of 
basal abdominal segment dark rufous. Wings hyaline, the nervures black, 
the posterior part of the stigma fuscous, the disco-cubital nervure largely 
bullated at the base of the apical third, the recurrent nervure largely in 
the middle ; it is received at the base of the apical third of the areolet, 
which is twice longer than wide. Parapsidal furrows crenulated; the 
mesonotum smooth ; scutellum strongly but not very closely punctured. 
The centre of the basal part of the metanotum is smooth at the base and 
apex, the rest finely, closely, irregularly striated, with scattered punctures ; 
the outer part is strongly punctured, the punctures clearly separated, the 
basal two-thirds of the apical part strongly, closely, irregularly striated ; 
the apex less strongly, more regularly, striated, with the striae distinctly 
separated. Propleurae smooth, with a striated belt near the base. Meso- 
pleurae closely, irregularly reticulated, a closely, obliquely striated band 
below the tubercles, the apex smooth near the top. Metapleurae more 
strongly and closely punctured than the mesopleurae, the lower part near 
the centre more or less obliquely striated ; the parts beyond the apical 
furrow striated. Mesosternum more strongly and regularly punctured than 
the mesopleurae. First abdominal segment smooth, except narrowly at 
the base ; there is a conical depression near the base of post-petiole, and 
