HYMENOPTERA 39 
Formicina, the ants. Many 
species with high social develop- 
ment. 
Sphecina, the digger wasps. Soli- 
tary in their habits. A large group, 
including many families. 
Vespina, the true wasps. One 
group is solitary and another social. 
Apina, the bees. Various habits, 
but all collect pollen or honey to 
feed their young. 
The number of deseribed species 
30,000. 
Fie. 41.—Abee, Bombus. Original. 
of Hymenoptera is in excess of 
