166 Annals Entomological Society of America [Vol. VIII, 
blue while the ones infested with this latter variety are green 
and smaller, the mites being present within the seed. In 
Europe, E. quadrisetus typicus is said to deform the berries of 
Juniperus communis in a somewhat similar manner while 
Eriophyes quadrisetus juniperus works at the bases of the leaves, 
causing them to swell (Laggerheim 1899). 
Egg. The egg is translucent and whitish. It is oval in 
shape, with bluntly rounded ends. The longer axis measures 
about 50 w, and the shorter axis about 35 uw. They occur in 
great numbers in the berry during the growing season. 
Life History. The winter is spent by the mites within the 
berries, principally in the greener ones and those not eaten out 
by the chalcids. With the approach of spring, the mites 
become active, leave the berries, many of which are still on the 
tree, and begin entering the young ovules. These soon become 
deformed and eggs are laid in them. Here the young find 
sustenance and make channels radiating out from the original, 
central burrow. Through the tiny openings at the ends of 
the berry, the adults pass to and fro and seek other ber- 
ries, just past the flower stage, to start new colonies. The pro- 
duction of the young is continuous throughout the growing 
season. During October, the mites begin to collect in certain 
berries where they pass the winter, losing most of their greenish 
color and becoming brownish. 
The berries of mature trees are, practically without excep- 
tion, deformed by the mites, while those of young trees are 
usually normal. It seems probable that the berries develop 
quicker in the latter case before the mites have a chance to enter 
the ovules; while on the old trees, the berries develop slowly 
enough to enable the mites to get out of their hibernating 
quarters, and find the ovules before they have become sunken. 
THE JUNIPER BERRY CHALCID. 
Eurytoma juniperinus, n. sp. 
Life History. This species is plant-feeding in habit and 
found in the fleshy portion of the deformed berries, but never 
in the seed tissue of Juniperus virginiana. ‘There is but one 
generation a year and the winter is passed in the larval stage. 
On May 26 the insect was already found in the pupal stage, 
while on May 29 adults were observed emerging. On June 26 
