More Hunting Wasps 



substituted dish, a victim to her liking, an 

 equivalent of her Grey Worm. 



So with the rest, as far as I have been able 

 to experiment with them. Each obstinately 

 refuses what Is alien to her hunting-pre- 

 serves, each accepts whatever belongs to 

 them, always provided that the game substi- 

 tuted is much the same in size and develop- 

 ment as that whereof the owner has been de- 

 prived. Thus the Tarsal Tachytes, an ap- 

 preciative epicure of tender flesh, would not 

 consent to replace her pinch of young Acri- 

 dlan-grubs with the one big Locust that 

 forms the food of Panzer's Tachytes; and 

 the latter, in her turn, would never exchange 

 her adult Acridlan for the other's menu of 

 small fry. The genus and the species are 

 the same, but the age differs; and this is 

 enough to decide the question of acceptance 

 or refusal. 



When its depredations cover a somewhat 

 extensive group, how does the Insect man- 

 age to recognize the genera, the species com- 

 posing her allotted portion and to distin- 

 guish them from the rest with an assured 

 vision which the inventory of her burrows 

 proves never to be at fault? Is it the ge- 

 neral appearance that guides her? No, for 

 in some Bembex-burrows we shall find 

 178 



