BEES AND THEIR ENEMIES. 117 



tually associating with their sitos. Some of the Chrysi- 

 did(B are likewise, as I shall have occasion to notice in 

 the description of the hahits of the genera, similarly 

 parasitical upon some of the species of the family of 

 bees. The genus Mutilla is also probably entirely para- 

 sitical upon bees, for Mutilla Europaa is a parasite upon 

 Bombus lapidarius, from whose nests it has been dug in 

 winter, by my friend the late Mr. Pickering, whose ac- 

 tivity aiid accurate observation once promised to be very 

 beneficial to the science, but he, like many others of my 

 entomological friends, is now no more ! 



