150 



ARTHROPOD A. 



FOSSOEES. Neuters, if any, winged. Basal joint of the pos- 

 terior tarsi cylindrical. A sting. 



The neuters are mostly, perhaps entirely, confined to the 

 Vespida3. Nearly all the species are fossorial ; but there is no 

 special adaptation of legs, except that in some the anterior tibiae 

 and tarsi are ciliated. They burrow in rotten wood, twigs, sand 

 banks, or construct mud or paper nests. The larvae often feed 

 on other larvae, flies, spiders, &c., provided by the mother. 



The females of Mutillidae are wingless. The upper wings in 

 Vespidae ( = Diploptera) are folded longitudinally. 



Pison. 



Tachytes. 



Astata. 



Mellinus. 



Cerceris. 



Philanthus. 



Sphex. 

 Ampulex. 

 Trigonopsis. 

 Ammophila (Sand- 

 wasp). 

 Miscus. 

 Pelopoeus. 

 Chlorion. 



Pompilus. 



Dolichurus. 



Aporus. 



Pepsis. 



Mygnimia. 



Ceropales. 



MELLIPERA (Bees). Neuters winged. Basal joint of the pos- 

 terior tarsi dilated, adapted for collecting and carrying pollen. 

 A sting in the females and neuters. 



The only genera having neuters or workers in this country are 

 Apis and Bonibus. The basal joint of the posterior tarsi is 

 scarcely dilated in the solitary species. These deposit their 

 eggs either in the nests of other species whose young are starved 

 by the intruders, or they form nests in twigs, rotten wood, old 



