18 
Psyche 
[March-June 
One male. Neumannis Boma, British East Africa (Allen 
and Brooks) . Type in the Museum of Comparative Zoology. 
This species traces to Eumerus scaber in Bezzi’s key. 
That species is said to have a bare bluish front ; its genitalia 
are reddish. The occiput of this species cannot be described 
as black pilose, etc. In Herve-Bazin’s key it traces to 
Eumerus fece Bez. with which it could hardly be confused. 
Microdon argentinae n. sp. 
Plate II, fig. 5. 
Male. Front narrowed sharply above antennae. The nar- 
rowest width slightly better than one-half width at vertex 
measured from upper eye angles. The narrowest portion 
marked by a prominent groove on its front side obtusely 
widened and leading down to a point between antennae. 
Front and vertex and face rich shining brown. Cheeks a 
little darker brown. Face strongly convex, both from the 
side and from above. Vertex slightly raised. First joint of 
antennae light shining brown, as long as front from vertex 
to depression. Remainder of antennae wanting. Pile of face 
and head everywhere pale yellow, sparse, shorter on the 
front, rather long and thicker on the sides of face below 
antennae. Middle of face nearly bare, possibly due to denu- 
dation. 
Dorsum of thorax, pleurae, scutellum, and legs rich shin- 
ing brown, the abdomen pale brown. Pile of thorax short, 
pale, appressed, with a few scattered darker hairs. Scutel- 
lum quite wide, trapezoidal, the small but slender, sharp, 
bare points, quite far apart, slightly diverging. Middle of 
scutellum not emarginate. Halteres dark brown. 
The abdomen is of the short broad form, pointed apically, 
with ventral flexure at the edges of the flared second segment. 
Piles of legs dark brown, becoming golden brown on lower 
surfaces of tarsi and apical portions of tibiae. Hind basitarsi 
not remarkably thickened, its greatest thickness basally, 
twice its distal thickness, perhaps a little more than twice as 
thick as the second tarsal segment. 
Wings tinged rather uniformly with brown. Veins dark 
brown. Last section of fourth longitudinal vein very angu- 
lated, emitting a stump on each side toward margin of wing, 
