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 PMlanthus, 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 Andrenida, 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 wings. 



Genus 7. MACEOPIS, Panzer. 

 (Plate V. fig. 2 c? .) 



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 



