. 
The Hymenopteru of the Georgetown Musewin. 439 
deeper and more clearly defined. Apex of clypeus with a shallow but distinct 
almost semi-circular incision. The 3rd antennal joint is almost double the 
length of the 4th . Thorax finely, weakly punctured, the basal part of the 
metanotum aciculated, the apical slope on either side of the furrow rather 
strongly obliquely striated. There is a distinct band on the apex of pronotum 
of dense golden pile one at the base of metanotum and the sides of the meta- 
notum are densely covered with longish golden hair ; the sternum is densely 
covered with pale pubescence. Abdomen covered with a pale golden pile, 
which is denser on the apical segments. 
Comes near to T. aztecum, which may be known from it by the black legs 
and black Ist abdominal segments, by the bidentate apex of clypeus and rufous 
base of flagellum - it is also a larger, more robust species. 
Trypoxylon brevicarinatum, sp. 1. 
Black, the head and thorax covered with silvery pubescence and more 
sparsely with silvery hair, the scape of antenne pedicle and base of 3rd joint, 
mandibles and the fore keees rufo-testaceous, the spurs, base of tibie and the 
basal 3 joints of the fore tarsi of a paler testaceous colour ; the base of the 2nd 
joint of the abdomen, of the 3rd more widely and regularly testaceous : wings 
clear hyaline, the nervures and stigma black; the tegule piceous. Immedi- 
ately below the ocelli is a large, raisea oval area, longer than wide, a shallow 
furrow down the centre of the upper half ; from the centre of the apex a dis- 
tinct keel runs down to near the antenne. There is a longish oval fovea in the 
centre of the basal half, it bears 5 stout clearly separated strig, there are 5 
stout transverse keels on the apical two-thirds of the apica’ furrow. The 
abdomen is more than twice the length of the head and thorax united ; the Ist 
segment is as long asthe thorax. female. 
Length 12 mm. 
Trypoaylon marginatuim, sp. n. 
Black, the antenne, except the top of the flagellum, a nafrow, but distinct 
line on the apex of the clypeus, mandibles except the teeth, paipi, the 4 
anterior knees, tibi# and tarsi and the base of the hind tibia testaceous ; the 
basal joint of the hind tarsi white except .n the apical half above ; wings hyaline 
the nervures and stigma black. the apex of the wings slighty clouded. Front 
with a clearly defined area, somewhat triangular in shape, the top broadly 
rounded, from there gradually narrowed to a sharp point; longer than it is 
wide above, it is separated from the lower ocelli by the distance the latter is 
from the upper ; a stout keel runs from the apex oz the area to the tup of the 
apex. Apex of clypeus broadly rounded. The basal area on the metanctum 
is clearly defined, the outer furrows broadly rounded and bear 6 strie, the 
apical 3 smaller and closer together than the basal; the central furrow wider, 
of equal width, the keels fine, curved, the apex almost free from striez; the 
