10 Psyche [February 
Fruit JARS FOR REARING BORERS. 
The jars may be used successfully for rearing borers from twigs, 
rotten wood, bark and fungi. Moist sand should not be added in 
this case, otherwise mold will develop. 
Fruit JARS WITH CHEESE-CLOTH Tops. 
The jars may be used with cheese-cloth covers especially during 
damp or rainy weather. Such covers have disadvantages com- 
pared with the tin tops. Much time is consumed in tying on the 
cheese-cloth, or if rubber bands are used, they are apt to break and 
allow the insects to escape. In dry weather the food does not 
remain fresh by the use of the cheese-cloth tops. 
OTHER METHODS. 
Caterpillars Reared in Bulk. 
If several hundred larve of a species, that normally pupate in 
the soil, are to be reared together, the following method has 
proven successful: 
A pen or corral was made of sheet tin or zine. This was placed 
in the soil to a depth of two inches, while the upper edges were 
tanglefooted or the top covered with cheese-cloth. The tangle- 
foot prevents the larvee from crawling out, but cheese-cloth is at 
times preferable if parasites are abundant. 
The mortality from wilt and other diseases is generally quite 
high in this type of rearing cage because the crowding aids the 
spread of infection. 
Tin Boxes. 
Isolated material is often desired, especially in experimental 
studies. For this work, I make use of small tin boxes with tightly 
fitting covers, one inch deep and two and a half inches in diameter. 
These boxes take up very little space, are easily cleaned by boiling 
in water or by sterilizing, and can be used repeatedly. They 
prevent parasites from entering and the larvee seem not to suffer 
in the least from the confinement. If the boxes are shaded the 
food keeps fresh for several days or until eaten. 
When the larve are nearly ready to pupate, a little sand is 
placed in the boxes. Moisture emitted by the food and larve is 
generally sufficient, but a few drops of water may be added to the 
sand when needed. 
