The Hymenoptera of the Georgetown Museum. 431 
of 2nd cubital cellule longer than the lower branches, the transverse cubital 
nervures received close to each other in front, separated by distinctly less 
than the distance separating the recurrent nervures, these being separated 
by the same distance as the Ist is‘from the base of the cellule ; the anal cellule 
in hind wings ending before the origin of cubital nervure. Apex of post 
scutellum bilobate, the lobes large, bluntly triangular. Sides of metanotum 
above ending mm a Jong, stout spine, nati owed towards the apex, the apical half 
testaceous. Metanotum areolated, the central basal area longer than wiae, 
roundly narrowed towards the base, the centre with a keel which bifurcates 
at the apex ; the central apical is longish triangular, surrounded at the top by 
a row of 4 smaller are ; below its middle it is jomed by 2 oblique keels. Head 
alutaceous : there is a stout keel outside the eyes behind. Pronotum smooth 
its base with some short, stout striz. Mesonotum alutaceous, covered with 
shallow punctures, the basal half in the centre with a wide shallow furrow, 
the apex with deep irregular furrows. Scutellum margined, the apex trans- 
verse ; there are 2 longitudinal keels un either side of the middle, the inner 
stouter than the outer. Mesopleure punctured, densely covered with white 
pile, the pro- and metapleura smooth, bare ; there are 2 longitudinal keels on 
the base of the latter above. Abdomen punctured, the puncturation becom- 
ing gradually weaker. The pygidium is longitudinally punctate ; the apex 
is transverse ; the sides and hypopygium are dark rufous ; the latter is bordered 
by afurrow. Apex of clypeus transverse, dark testaceous, margined. Apex of 
scape and pedicle rufous. 
This species cannot well be confounded with any of the few described Neo- 
tropical species of Nysson. 
Monedula punctata, Fab, 
Handlirsch, Sitzung. d. Kais. Akad. d. Wissen. in Wien, 1890, xcix, 97. 
Bembex multipicta, Smith. 
Ann. Mag. Nat. Hist. xii., 300 (nee Male) 1783, Cam., Biol. Cent. Amer. ii 
100. PI. vi f. 17, 18; Handlirsch, l.c. supra, 831. 
> 
Bembex guiana, sp. n. 
Antenne black, the scape yellow, lined with black above. Head black, the 
clypeus except for a black mark in the middle above, broad above, gradually 
narrowed below, labrum, the mandibles except at the apex, the face, a line above 
the antenne, its top narrowly black in the centre, a broad line on the inner 
orbits, commencing at the ocelli, the top obliquely narrowed on the innerside 
aud a uarrow line on the outer orbits, narrower above than below. Pro- 
thorax yellow, a black line across the lower part of the pronotum, continued on 
to the pleurze where it becomes gradually narrowed to a fine point at the end. 
Mesonotum black, a line along the sides, its basal half wider than the apical 
and a narrower one on either side of the middle, it reaching nearer to the 
base than to the apex. a broad, narrowly interrupted line on the base of the 
scutellum, dilated on the outer side, post-scutellum, a curved line on the 
base of the metanotnm, widened in the middle and extending on to the apical 
