In the accompanying illustration are shown the habitations of two remarkable insects, both belonging to the hymenoptera.
Metapodeon: the abdomen behind the podeon or petiole in hymenoptera.
All hymenoptera have a complete metamorphosis, and their habits and instincts are, as a rule, very highly specialized.
Pieza: the combined biting and sucking mouth of the hymenoptera.
In the Libellulina and hymenoptera it is merely represented by a low ridge, and in the Diptera it seems evanescent.
Post-annellus: in hymenoptera, the 4th joint of antenna and 2d of flagellum.
This supplies a partial explanation of the twofold diet of the hymenoptera with carnivorous larvae: meat first, honey next.
Sessiliventres: hymenoptera in which the abdomen is sessile.
The Aculeata contains the great majority of the hymenoptera.
The different habits of the hymenoptera in this respect are very interesting.