288 
BRITISH BEES. 
perhaps one or two of the Nomadce, I used to find in 
abundance upon the railings of the fields that skirt 
Hampstead Heath, on the right-hand going from Lon¬ 
don, parallel with the Yale of Health, and thence rising 
to the Holly enclosure of the Earl of Mansfield’s man¬ 
sion. This spot has been productive to me of many 
very choice aculeate Hymenoptera, and supplied me 
with them in abundance at a time when even the chief 
metropolitan collections were bare of them. It has also 
furnished me with several very desirable Diptera of ex¬ 
tremely rare genera. The male of the larger species of 
this genus Linmeus called florisomne, from its habit 
of curling up its abdomen and antennse, and passing the 
night in flowers. Those which they chiefly frequent 
are the species of W all flower, and the Campanula , espe- 
ciallv the round-leaved Throatwort. 
Genus 22. HERIADES, Spinola. 
(Plate XIII. fig. 3 $ $ .) 
Apis ## c 2 y partly, Ivirhy. 
Gen. Char.: Body glabrous and much punctured. 
Head globose and curving to the thorax posteriorly ; 
ocelli in a triangle far forward on the vertex ; antennce 
slightly subclavate, the scape not half so long as the 
flagellum, the first joint of which is robust, subclavate, 
and twice the length of the second, which, with the rest, 
are subequal, very slightly lengthening to the terminal 
one, which is as long as the basal one and laterally com¬ 
pressed ; face slightly convex, cheeks large and convex; 
clypeus lunulate, convex, and with two minute central 
teeth on its front margin ; labrum longitudinally oblong, 
