CHAPTER IV 

 The Enemies of Plant-lice 102 



Xylocelia metathoracicus 

 Ceratophorus tenax 



CHAPTER V 



The Bee-killing Wasps 109 



Philanthus punctatus 

 Pseudanthophilus vertilabris 



CHAPTER VI 



Some Mud-daubing Wasps that Hunt Spiders 118 



Sceliphron caementarium 

 Chalybion caeruleum 



CHAPTER VII 



Some Wasps that Prey on Beetles 126 



Cerceris fumipennis 

 Scolia dubia 



CHAPTER VIII 



Some Wood-boring Wasps 133 



Cerceris finitima 

 Trypoxylon tridentatum 

 Silaon niger 

 Trypoxylon davatum 

 Trypoxylon johnsoni 



CHAPTER IX 



The Hunters of Small Orthoptera 140 



Alyson melleus 



Tachysphex terminatus 



Tachysphex fuscits 



Tachysphex obscurus, and T. obductiis 



Notogonidea orgentata 



