I.] HALICTUS, PANURGUS, ANTHOPHORA. 21 



velopment of the hairs is most marked on those seg- 

 ments of the hind legs which are most conveniently 

 situated for the collection and transport of pollen. In 

 Panurgus, the same change is still more marked (Fig. 

 25) and the pollen-bearing apparatus is confined to 

 the tibia, and first segment of the tarsus, a differen- 

 tiation which is even more apparent in Anthophora 

 (Fig. 26). In all these bees the pollen is simply en- 

 tangled in the hairs of the leg, as in a brush, but there 



FIG. 25. Left hind-leg of Panurgus 

 banksianus. 



FIG. 26. Right hind-leg of Antho- 

 phora bimaculata. 



are other genera, of which the humble bees and the hive 

 bees are the only British representatives, which moisten 

 the pollen with honey, and thus form it into a sticky 

 mass, which is much more easy to carry, and is borne 

 not round the leg, but on one side of it. In the 

 Humble-bee (Bombus, Fig. 27) for instance, the 

 honey is borne on the outer side of the hinder tibiae, 

 which are flattened, smoothed, and bordered by a 

 row of stiff curved hairs, thus forming a sort of 



