234 HYMENOPTERA. 
mon flies feed very much upon spiders, 
on which they pounce as the hawk 
does on its prey. 
Lucy, Old and young, flying and 
creeping, I see they are always carni- 
vorous. 
Mother, As far as their hahits of life 
have been investigated^ I believe they 
are. 
We will now see how the genus is 
characterised. Antennae of more than 
thirty joints, long, filiform, and always 
vibrating — sting within a bivalve sheath 
— mouth armed with jaws, no tongue — 
abdomen joined to the body by a pedicle, 
or stalk. 
Lucy. I wish, mamma, I could find 
a caterpillar with some of these little 
larvae feeding in it. 
Mother, If you collect a number of 
the common cabbage caterpillars you 
will be very likely to find one or more 
among them loaded with these inward 
de\*ourers. 
