XXXIII. MIMESA. 231 
cence on the face, the legs more ferruginous, the antennz 
slighter, and ferruginous at their apex above as well as be- 
neath, the posterior tarsi being of that colour; more black at 
the base of the abdomen, which is longer, narrower ; and some- 
times merely the second segment red, and the hypopygium pro- 
duced into an upcurved acute spine. 
@ 2 in my own Collection. 
t4} This species, which is the most common of the two 
red ones, has evidently been mixed with the preceding, 
from which it differs somewhat in general habit, but es- 
pecially in the form of the petiole of the abdomen. Ju- 
rine’s figure is excellent, and perfectly represents it, as does 
Mr. Curtis’s the preceding species. It is gregarious, being 
found in multitudes upon Hampstead Heath, Black Heath, 
and in most sandy situations. 
Spe. 3. unicotor. V. d. Lind. 
ater, leviter griseo pubescens, clypeo gibboso et fronte plana 
argenteo pubescentibus ; metathorace reticulato-rugoso, tarsis 
rufescentibus. 
length 24—33 lines. 
Psen unicolor, V.d. Lind. pt. 2. 105. 3. 
Entirely black: head punctured, pubescent; the face covered 
with a silvery down; a very slight carina between the base of 
the antennz extending upwards to the vertex, and terminating 
abruptly at a slight transverse one, which extends on each side 
to their points of insertion; the clypeus very convex, reflexed 
in front, where, in the centre, it is slightly emarginate ; the apex 
of the mandibles rufescent. 
Thorax punctured, pubescent; the dorsolum with two cen- 
tral parallel impressions at its base, which extend to the disk, 
and a scratch on each side parallel with the middle of the epaulet 
of the tegule; the incisure at the base of the scutellum con- 
sute ; the metathorax reticulated; the tegule piceous or black ; 
