132 SYRPHID ©. 
137. Microdon luteiventris, sp. n. 
3 2. Length of body in the male 14 mm., in the female 17 mm. ; 
length of antenna 4°5 mm. 
A broad and plump black species with bright yellow face and 
abdomen, and with longer pubescence than in the two preceding 
species. 
This species seems to be very nearly allied to my J. erythros, 
from the Congo, which, however, has a bright red abdomen, like 
that of the H ymenopter on Kwaspis erythros, Meun. 
Male. Head black, the face yellow from the base of the antennz 
to the margin of the buccal cavity, but the jowls are black ; occiput, 
face, and a transverse band across the centre of the fone clothed 
with dense but short erect hairs of a pale yellowish colour; frons 
elsewhere clothed with black hair, but above the antennez with a 
triangular, smooth and shining, bare area; frons very finely pune- 
tate ; ocelli not so close together as in the other species ; eyes 
shining black, with facets of “equal size, the inner angle of the eyes 
somew hat convergent, the transverse furrow on the Pronn not very 
pronounced ; face gently convex, very broad, broader below than 
above; jowls with a broad depression near the margin of the buceal 
cavity ; antenn black, first and second joints clothed with black 
hairs ; tlaed joint a little shorter than the first, with a black, thin, 
ther long arista; second joint less than one-third the length of 
the first; opening of buceal eavity small; proboscis yellowish. 
Thorax placic subquadrate, finely punetate, clothed with rather 
dense yellowish pubescence, which forms a broad band in front, 
another narrower one on the suture and a smaller one before the 
scutellum ; the hind part of the dorsum is clothed with short black 
hair; pleure on the fore half with yellowish pubescence, on the 
hind half bare and smooth. Scutellum rather small, semicircular, 
with long, erect, yellowish hairs. Squamule black, the alar yellow- 
fringed, the thoracie black-fringed; halteres pale yellowish. Ab- 
domen at base much broader than the thorax; the first segment 
is black, the other segments and the belly a yellow, w ye short 
yellowish pubescence on the sides, base, and end, and with black 
pubescence on the middle, where the surface is somewhat dull; 
genitalia yellow; abdomen very finely punctate; third segment 
twice as long as the second; fourth two and a half times as long as 
the third. Legs short and stout, entirely shining black, rather 
thickly clothed wth black hair; claws black, pulv li dark yellowish ; 
tarsi broad and short. very shining above, especially the first joint 
of the hind tarsi, which is rather thick Wings lightly infuseated, 
with strong black veins and sometimes with broad black borders 
along the veins: outer corners of subapical and discal cells rounded, 
and without appendices ; stump on third vein long. 
Female, Like the male, but broader, longer, sad darker-coloured ; 
head as in the male, with broader frons, and only on the occiput 
and on upper part with black hairs; hind occipital border less 
