On the Hymenoptera of the Georgetown Museum. 315 
down its middle, with 2 or 3 short stout keels on either side of its apex. The 
keels on the 2nd and 3rd abdominal segments are smooth and longly dilated 
at the base. 
Megarhogas melanonotus, sp.n. 
Testaceous, the abdomen darker coloured, especially towards the apex ; 
the vertex, mandibular teeth, the pro-and metanotum, the propleure, except 
at the base and apexirregularly above, the upper part and base of the 
mesopleure black, the mesosternum fuscous; antenne dark rufous, lighter 
coloured at the base; basal 2 joints of the maxillary palpi blackish, the 
others testaceous ; they are thickly covered with white pubescence ; legs (and 
especially the tibiz and tarsi) lighter coloured than the body ; wings hyaline, 
the costa and stigma rufo-testaceous, the nervures, and especially the 
anterior, lighter coloured ; the 3rd abscissa of the radiuslonger than the 
basal 2 united ; the 2nd cubital cellule distinctly narrowed towards the apex ; 
the Istabscissa of cubitus broadly roundly curved; the recurrent nervure 
received near the apex of the Ist cubital cellule, the anterior two-thirds of the 
lst transverse cubital nervure obliquely bent towards the radius, the lower 
third, the cubitus beyond it broadly and the 2nd transverse cubital nervure, 
except at top and bottom, bullated. On the centre of the metanotum are 
2irregular keels which converge towards the base ; from near their apex run 2 
irregular transverse ones. Face pallid yellow, covered with longish white 
hair ; the mesonotum more densely covered with short, dark pubescence ; 
the metanotum with longish pale hair; the abdomen densely with short 
pale pubescence. Female. Length 13 m.m. 
The apical half ofthe 1st abdominal segment irregularly striated, more 
strongly towards the apex, the second more strongly striated, the basal half 
much more strongly than the apical ; there is a narrow keel down the centre of 
the Ist and 2nd ; that on the 2nd becoming gradually fainter. 
This is a smaller species than M. fuscipalpis ; it may be known by the 2nd 
cubital cellule being narrowed towards the apex, by the black propleure and 
base of megopleure. 
Megarhogas fuscipalpis, sp.n. 
Testaceous, the abdomen from the middle of the Ist segment fuscous, the 
vertex and the greater part of the mesonotum black, the antennal scape testa- 
ceous, the flagellum fuscous, almost black ; wings hyaline, iridescent, large, 
the stigma parastigma and costa rufo-testaceous, the nervures of a dark testa- 
ceous colour ; the Ist abscissa of the cubitus roundly curved, the 2nd longer 
than the 8rd, the recurrent nervure interstitial ; the Ist transverse cubital 
nervure obliquely bent from shortly below the middle, the nervure dilated at 
the junction of the 2 curves ; the 2nd cubital cellule is of equal width and is 
two and a half times longer than wide ; the 2nd transverse cubital nervure 
has the fore half slightly obliquely bent towards the stigma. The basal 2 seg- 
ments of the abdomen are strongly, closely striated and with a narrow keel down 
the middle ; the 3rd is more weakly striated. Female. Length 18 m.m, 
