468 P. Cameron. 
centre transversely striated, the striae becoming narrower 
below and bordered there by a smooth, shining 
part. Pro- and mesothorax closely, distinctly, almost 
uniformly punctured; the scutellum more strongly, 
not so closely and more irregularly punctured; the apical 
slope below closely striated. Post-scutellum finely, closely 
striated ; the apex below smooth. Metanotum at the base 
on the lateral basal areae punctured, more or less reti- 
culated on the inner and outersides, the apical area on 
the outer basal part, finely, the inner and apex much 
more widely reticulated; the posterior median area with 
a few broken keels on the top, the middle irregularly 
punctured, the apex smooth; the lateral areae with a few 
stout oblique keels; the spiracular irregularly stoutly, ob- 
liquely striated. Metapleurae strongly, closely punctured. 
Basal 3 segments of abdomen closely, regularly punctured. 
the puncturation becoming gradually weaker. Tarsi 
minutely spinose. 
Exochini. 
2. Megatrema sen. nov. 
Metanotum with 2 stout keels, straight and parallel 
on the basal half, curving round the top of the apical 
slope, in the centre of which are 2 keels, thinner and 
converging below ; the spiracles are very large, oval, 
more than twice longer than they are wide in the middle; 
outside them is a curved keel, which ends in a deep 
pyriform area. First joint of flagellum longer than the 2nd, 
First abdominal segment sessile, as long as it is wide 
at the base; the spiracles placed at the base. Wings 
with a small, triangular, appendiculated areolet, receiving 
the recurrent nervure at the apex; the transverse median 
nervure interstitial; the transverse median nervure in hind 
wings angled and broken half way between the middle and 
lower part. Mesonotum and scutellum flat; the abdominal 
segments without keels. Vertex not separated by a keel.— 
There is a distinct malar space ; the face and clypeus form 
one piece; temples short, sharply obliquely narrowed. 
Ocelli in a curve, the hinder separated from each other 
by double the distance they are from the eyes. The 
sides of the metanotum at the middle are roundly curved 
inwardly. Pterostiema longish, not much thicker than the 
costa; the radius issues from the apex of the basal third. 
There are 2 large spurs on the hind tibiae, the larger 
reaching beyond the middle of the metatarsus. Mandibles 
