BEES AND THEIR ENEMIES. 
117 
tually associating with their sitos. Some of the Chrysi- 
didce are likewise, as I shall have occasion to notice in 
the description of the habits 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 and accurate observation once promised to be very 
beneficial to the science, but lie, like many others of my 
entomological friends, is now no more ! 
