220 
BRITISH BEES. 
bred at their expense, and some of the Ichneumons 
attack them, as well as the fossorial Hymenoptera of the 
genera Cerceris, Crabro, and Philanthus , and these 
latter carry them off bodily to furnish their own nests 
with pabulum. Several of the species exhale a rich 
balmy odour, and, like all the Andrenidce, they are 
silent on the wing, and their sting is innocuous and not 
painful. The males are very eager in their amours, and 
are not easily repulsed. 
Some of the species vary slightly in the neuration of 
the wings, and this being a rather numerous genus, al¬ 
though not nearly approaching the extent of Andrena, 
it has been proposed to make use of it for its division, 
but I think this is scarcely required, it not being suffi¬ 
ciently abundant to cause any inconvenience, the species 
being so distinctly marked in their specific differences by 
the aid of the metallic brilliancy of several of them. I 
have therefore arranged the species in the above list in 
connective order without intermission, and have placed 
in juxtaposition those species which appear the closest 
in affinity. 
b. With two submarginal cells to the icings. 
Genus 7. MACROPIS, Panzer. 
(Plate V. fig. 2 $ $ .) 
Gen. Char.: Head transverse, as wide as the thorax, 
flattish ) ocelli placed in a very open curve upon the 
vertex; face flat, but convex in the centre beneath the 
insertion of the antennae; clypeus very slightly convex; 
labrum transverse, narrowly lunulate; mandibles biden- 
tate; cibarial apparatus moderately long; tongue very 
