1917] Wileox—Rearing Insects for Experimental Purposes 9 
CARE OF THE Pup. 
As soon as the larve have pupated, the jars are cleaned and 
moist sand is put in. When moistening the sand, just enough 
water is added to darken it. The covers are screwed down tightly, 
but are removed every few days to allow a circulation of fresh air. 
If the sand becomes too moist, the covers are loosened; if too dry, a 
few drops of water may be added. 
CARE OF THE ADULTs. 
Before emergence, some bits of coarse hay, dry moss or pieces 
of paper are inserted into the jars to provide a resting place for the 
adults as soon as they appear. If perfect specimens of large 
species are desired the lidless jars are placed in a large wooden or 
pasteboard box. A stiff piece of paper or cardboard is inserted 
into each jar so the adults may easily crawl out. This arrange- 
ment will provide sufficient room for them to expand their wings 
and dry perfectly. 
Martine rue Apvtts. 
Some species of insects mate in almost any situation, but the 
majority prefer a simulation of their natural environment. These 
conditions may be provided in a number of ways. One of the most 
satisfactory methods is to grow the food plant of the species of 
insect concerned in a box of soil. When matings are desired, a 
small cylindrical wire screen or lamp chimney is placed over some of 
the food and the males and females placed thereon. When it is 
necessary for the adults to feed before mating, sugar-water may be 
provided. ‘The mating cages should be shaded and left undisturbed 
until after the deposition of the eggs. 
HIBERNATING Pup. 
The fruit jars have been used with great success in caring for 
hibernating pupx. Species that normally hibernate in the soil are 
placed in jars filled nearly half full of moist sand. This moisture 
will ensure sufficient humidity for several weeks. The jars should 
be opened every week or two to allow a circulation of fresh air. 
This also assists in the prevention of mold development. Jars 
with hibernating pup have been kept in a greenhouse where the 
temperature ranged from 60° to 80° F. during the day and from 45° 
to 55° F. at night with success. The jars should be shaded. 
