On the Hymenoptera of the Georgetown Museum. 163 
ing at the apical fourth of the radial cellule ; the stigma and nervures black ; 
the areolet square, the apical nervure faint, but distinct, receiving the recurrent 
nervure shortly beyond the middle; the transverse median nervure received 
very shortly behind the transverse basal, almost interstitial. Metanotum without 
an area at the base ; there is a distinct basal transverse keel and an indistinct 
one between the spines, which are short and broad; the base is irregularly 
punctured near the keel ; the middle space is irregularly obliquely striated, the 
striz closer on the outer side than in the middle ; the apical slope is more strong- 
ly obliquely striated ; the spiracles are twice longer than wide. There is a closely 
striated oblique band down the apical part of the mesopleure, the striz 
longer and stronger above and below ; the metapleure closely, distinctly punc- 
tured. 
Mesostenoideus ornatipetiolatus, sp.n. 
Black, the face, clypeus, labrum, palpi, the eye orbits broadly except for a 
black line near the top of the outer, a line on the prothorax near the base, slightly 
narrowed below on the pleure, a longish triangular spot on either side of the apex 
of the pronotum, two longish lines on the mesonotum along the furrow, turned 
outwardly at the base, where they are narrowed, tegule, scutellums, two curved 
transverse spots on the base of the metanotum, the spines, tubercles, a mark, 
longer than wide, oblique at the base and apex, a longer, slightly narrower one 
on the apical three-fourths below, its base rounded above, the apex obliquely 
narrowed following the line of the apical crenulated furrow, below with a short 
oblique branch running along the base of the sternal furrow, a large, oblique 
semi-circular mark, its base and apex shortly dilated, in the centre of the meta- 
pleure and a line on the apex of the first to seventh abdominal segments, yellow ; 
the first segment red except for the yellow apical line ; legs : the anterior 
yellow tinged with fulvous, the middle rufo-fulvous, the cox of both yellow in 
front, the hinder red, the coxee with a yellow mark at the base above, the apical 
fourth of the femora more than the apical half of the tibiz above, less than the 
half below and the tarsi black. Wings hyaline, the nervures and stigma black, 
the second transverse cubital nervure obsolete, the transverse median nervure 
interestitial. Male. 
Length 12 m.m. 
Antenne shorter than the body, serrate, tapering towards the apex. Face 
strongly punctured, striated above, the clypeus finely and closely punctured, 
the front keeled, in the middle, the rest obliquely striated ; three or four oblique 
keels run down from between the ocelli. Mesonotum strongly punctured, the 
scutellum more sparsely and weakly so. Metanotum with two curved keels on 
the base, running to the outer end of the pleurz past the spiracles ; the space 
enclosed by them longitudinally reticulated ; the rest is coarsely on the sides 
reticulated, in the depressed centre strongly tranversely striated. Propleure 
finely punctured, the apex striated, the striee longer in the middle. Mesonotum 
except in the middle closely, finely punctured, more closely above than below, 
the base and apex crenulated ; the sternal furrow strongly crenulated. Meta- 
pleure strongly reticulated. The second abdominal segment becomes gradually 
