The Hymenoptera of the Georgetown Museum, 213 
than the space bounded by the _recurrent nervures. The apex of pronotum 
forms a semi-circle. Apex of post-scutellum gradually narrowed to a bluntly 
rounded point. Some specimens may be largely infuscated. 
Polybia brunneiceps, sp. n. 
Chocolate brown, the upper part of the thorax darker in tint ; the sides of 
the thorax from near the top, the apex more narrowly, the inner orbits from 
the top of the incision where the line is narrowed, a line, three times longer 
than wide, on the base of the mandibles, a line on the vertex, running from 
the occiput, obliquely to near the middle of the eyes, the line nearly broken 
close to the base, the outer orbits, the line extending to the malar space, 
line round the pronotum narrowed at the apex, 2 lines on the mesonotum 
reaching near to the base and apex, a line of about the same width on the sides, 
close to the tegule, 2 semi-circular marks on the basal half of the scutellum, 
a line, somewhat broader than the mesonotal lines, on the base of the post- 
scutellum, its apex roundly curved inwardly, 2 large marks, rounded bluntly 
at the top and bottom, on the metanotum, the space between the 2 narrowed 
above, a line on the base of the propleure, gradually widened from the top to 
the bottom, a large mark on the base of mesopleure, longer than wide, slightly 
narrowed below, where it is transverse, and which does not reach to the end of 
the furrow, a smaller, vertical mark, almost semi-circular, on the metapleure, 
united above to a smaller spot which goes on to the metanotum at the hind 
wings, 2 moderately wide band—about the width of one-sixth of the petiole— 
—and continued narrowly backwards for a slightly greater distance along the 
lower edge of the sides, slightly narrower lines all round on the 2nd-4th 
and a narrower, shorter one on the centre of the 5th, above the anterior 
cox and the outer side of the fore tibiz, bright lemon yellow. Wings hyaline, 
the radial and the apical cubital cellule smoky, the stigma piceous, the nervures 
black, the 1st abseissa of the radius as long as the 3rd; the 2nd about one- 
fourth of their length. Abdominal petiole as long as the 2nd segment and 
about half the length of the thorax ; the basal third narrow, the middle becomes 
oradually widened, the post-petiole ofequal width ; the 2nd segment. bell- 
shaped, as long as it is wide at the apex. Antennal scape yellow, brownish 
above, the flagellum rufous, darker, almost fuscous above. Female. Length 
7—8 mm. 
Smooth, covered with a satiny white pile. Apex of clypeus gradually, 
obliquely narrowed from the eyes to the middle, where it ends in a tooth, 
Malar space almost obsolete. Ocelli in an equilateral triangle, the hinder 
separated from each other by half the distance they are from each other. 
Post-scutellum gradually narrowed to a bluntly rounded point at the apex. 
The brown or fuscous ground colour shows a tendency to become black. 
Polybia spilogastra, sp. n. 
Black, the face, clypeus, except for a line, about 3 times longer than wide, 
irregularly narrowed below, leading down from the antenne to the top of the 
clypeus, and the apex of the clypeus narrowly, a crown-shaped spot between 
