The Hymenoptera of the Georgetown Museum. 225 
apical two-thirds broadly rounded on the inner side, the outer straight, the 
whole forming almost a semicircle; there are no teeth. Clypeus large, forming 
almost a semicircle, the apex with a slight, shallow incision. Labrum large, 
triangular. Scutellum large, not much raised, depressed at the base and apex. 
Post-scutellum obliquely sloped, separated from the scutellum by a wide, 
deep furrow. Metanotum short, hardly longer than the post-scutellum, flat 
above, its sides bordered by a stout keel laterally, the apical slope steep, it, 
with the scutellums, form a slightly oblique slope, almost on one level, only 
separated by the divisions. Legs stout, the tarsal joints, spinosely dilated 
laterally. 
The head is wider than the thorax ; the temples wide, broadly roundea ; 
occiput margined. Eyes large, parallel, not converging below ; there is no 
malar space. Trophi moderately long. Base of thorax margined, transverse. 
Wings as in Zethus. This genus of Eumenide is sufficiently characterized 
and separated from Humenes and Zethus, the only genera with which it could 
be éonfounded, by the broadly rounded, toothless mandibles, by the thorax, 
having a straight, oblique slope from the base of the scutellum to the apex of 
the metanotum and by the longish abdominal petiole bemg of equal width 
throughout, not narrowed at the base as in Humenes, or at the base and apex 
as in Zethus. The head is larger, more cubital than it is in the 2 genera just 
mentioned. 
Baeoprymna rufo-ornata, sp.n. 
Black, a large semi-circular mark on the centre of the clypeus, commencing 
at the base, and extending shortly beyond the middle, a sightly curved line 
on the front uniting the antenne, the outer part of the eye incision, a short 
oblique line on the vertex running into the eyes, the inner, upper half of the 
eye orbits, the base of propleure broadly, its apex more narrowly on the 
upper half and the top still more narrowly, the outer and apical edge of the 
tegule narrowly ; the tubercles, a moderately Jarge, oblique conical mark 
below, a small irregular spot on the sides of the scutellum, shortly beyond the 
middle, one on the outer edge of the post-scutellum and the mandibles rufous ; 
the lower half of outer orbits, malar space, the sides and apex of the clypeus, 
leaving the upper reddish part as a large semicircular spot ; the reddish mark- 
ings on the head and thorax are edged with yellow; the apex of the Ist ab- 
dominal segment from the outer part of the middle above to the end of the 
sides narrowly and a narrower line on the apex of tne 2nd all round clear 
yellow. Legs black, the anterior except the coxe and the middle femora in 
front rufous. Antenne rufous, darker coloured above, stout, thickened to- 
wards the apex. 
Montezumia ghilianii, Saus. 
An example is probably this species. It is said to be a very variable species 
by Saussure, Syn. Amer. Wasps, 122. It certainly differs considerably in 
colouration from Brazilian specimens. 
Montezumia pallidimarginata, sp.n. 
Black, without blue or violet reflections ; the sides of the metanotum from 
the spine and the lower part of the spine pallid yellow, the knees and the claws 
