On the Hymenoptera of the Georgetown Museum. 309 
base of the stigma extending narrowly behind the transverse basal 
and transverse median nervure to the apical third extending obliquely along 
the outer side of the basalabscissa of the cubitusin the formofa longish 
triangle and filling the discoidal cellule, except narrowly along the recurrent 
nervure and more widely at the apex, the cloud there being roundly narrowed 
at the base ; the apex is clouded from there shortly beyond the 2nd transverse 
cubital, and there is a sub-apical and an apical cloud in the hind wings. Male. 
Length 12 m.m. 
Smooth, shining, the face, pleura, metanotum and legs thickly covered with 
white pubescence. The keel on the base of the 2nd is smooth ; it is a longish 
triangle at the base, the narrowed part reaches to the base of the apical fourth 
and is bordered by a wide furrow ; the lateral furrows are wide, curved, and 
not very deep; the Ist transverse furrow is narrow, moderately deep, 
with indications of obscure striz in the centre, the lateral apical branch is wide 
and shallow ; there is an almost similar furrow on the base of the 3rd anda 
similar, but narrower one on the 4th, there is an obscure longitudinal keel down 
the basal half of the 4th. The basal half of the mandibles rufous. Palpi, 
except the basal joint of the maxillary, pale testaceous and covered with white 
pubescence. 
Iphiaulax obscuricarinatus, sp.n. 
Black, the basal 4 abdominal segments and the 5th with a triangular mark on 
the basal half laterally, bright red ; the 4 front legs and the tegule yellowish 
testaceous, the hinder black, their trochanters,basal fourth of femora and basal 
half of tibia and spurs testaceous, wings fuscous, the base to the transverse 
median and to near the transverse basal and the middle from the parastigma 
to theend of the stigma, the cloud extending to shortly beyond the 2nd trans- 
verse cubital; in the hind wingsthereis acloud beyond the middle at the 
commencement of the radius. Male. Length 9m.m. 
Head and thorax smooth and shining, covered with white pubescence, which 
is long on the face and metathorax. Basal 4 segments of the abdomen closely, 
distinctly striated, the stria becoming gradually weaker; the dilated base of 
the keel on the 2nd segment small, bluntly dilated, the prolongation stout, 
reahing closetotheend ofthe segment; there isa broad curved furrow on 
either side of it, going down the outerside ; there is a transvers furrow on the 
base of the 38rd, curving forward at the sides; there is a similar, but less 
distinct one on the 4th. The 3rd abscissa of the radius is about one-half 
longer than the basal 2 united, the recurrent nervure is received near the apex 
of the 1st cubital cellule. 
Iphiaulax dolens, sp.n. 
Dark rufous, the legs of a darker tint than the body, inclining to fuscous, the 
antennz, head, palpi and prosternum black ; the head and thorax covered with 
white pubescence, which is longest on the face and metathorax ; wings fuscous, 
the stigma ochraceous yellow, its apex black ; the 3rd abscissa of radius nearly 
twice the length of the 2nd, the recurrent nervure received close to the trans- 
verse cubital. The bordering furrows on the Ist abdominal segment 
