2:30 TRANSFORMATIONS OF INSECTS. 
provisions they will form a silken cocoon, and hybernate in it 
until the next spring; then they will turn into nymphs, and, after 
two or three weeks have elapsed, they will fly as perfect insects. 
THE METAMORPHOSES OF Odynerius parietum. 
The Odynerus which attacks the briar chooses dry twigs 
which have a slanting direction, or which are horizontal. The 
insect sets to work to hollow out a twig by getting rid of the 
pith, and when this is completed it goes off to seck earth and 
