THE VESPIDH. 
231 
tiny stones, which it forms into a sort of clay. It then completes a 
cell and victuals it, and afterwards constructs a second and perhaps 
a third and fourth. Very often six or ten are to be found. 
The insect which occupies the cell nearest the opening becomes 
hatched before any of the others, although this cell was made last 
A SPECIES OF 
Odynerus. 
LARVA OF THE 
Odynerus. 
PUPA OF THE 
Odynerus. 
of all, so that the youngest egg hatches before the others. This 
is very wonderful, and by thus hatching sooner than the others 
this youngest Odynerus makes room for the free passage of the 
insect in the second cell, and so on. The cells open through one 
passage ; and if the insect in the most distant cell, and which 
was filled first of all, was hatched first, it would force its way 
through the other chambers to gain the open air, to the great 
detriment of the included larvae. 
Eumenes pomiformis is a black insect with yellow rings, which 
builds nests upon walls, and it does not hollow out the earth, but 
constructs little round capsules out of clay, sticking them to bricks 
and stones, and making one cell in each. In the engraving on 
page 232 these little nests are shown, and the mature insects are 
represented upon the wall. 
HYMENOPTERA WHICH MAKE THEIR NESTS OF 
PAPYRACEOUS SUBSTANCES. 
( Vespidce. ) 
The Hyinenoptera which make their nests with papery-looking 
substances are the Wasps, the true social wasps, and not the 
solitary wasps which belong to the genera we have just described. 
These true wasps are arranged in one large family, the Vespidce , 
which is subdivided into three groups, containing several genera. 
