288 JiRITISH 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 Vale 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 Linneeus 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 Wallflower, and the Campanula, espe- 

 ciallv the round-leaved Throatwort. 



Genus 22. Heriades, Spinola. 



(Plate XIII. fig. 3 <J ? .) 



Apis ** c 2 y partly, Kirby. 



Gen. Char. : Body glabrous and much punctured. 

 Head globose and curving to the thorax posteriorly; 

 ocelli in a triangle far forward on the vertex ; antennae 

 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, 



