deep on a piece of bark which the sender states was from an area of at 
least 50 square feet of eggs on the south side of trunks of cottonwoods 
growing at an elevation of from 6,000 to 8,000 feet. This was in the 
Sierra Nevada Mountains, Tuolumne County, Cal., and we have had 
a similar account, with 
specimens, from McCar- 
thy Mountain, in Mon- 
tana, at about the same 
elevation. In the Mid- 
dle and Eastern States, 
where the eggs are fre- 
quently found on fruit 
trees, they are usually 
confined to the crotches 
and branches and are 
not nearly so abundant. 
In the colder regions, 
where the winter’ is 
passed in the egg state, 
the issuance of the young 
mites the following 
spring varies from May 
until the middle of June, 
depending on the char- 
acter of the season. In 
the warmer regions—as, 
for instance, in the lati- 
tude of Washington, 
D. C.—the mites begin 
to be noticeable on foli- 
age and grass in May or 
earlier, and enter their 
hibernating quarters 
early in October, in crev- 
ices of fences or walls, 
or under the loose bark 
of various trees. It is 
seen, therefore, that in 
the warmer localities 
breeding is hardly inter- 
rupted during the win- 
Fic. 1.—Bryobia pratensis: a, dorsal view; b, ventral 
view; c andd, claw; e, f, g, mouth parts; h, i, j, body 
seales; k, l, m, leg spines (from Insect Life). 
ter months and the winter is passed quite as much in the active as in 
the egg state. Throughout the summer young are produced continu- 
ously, as with most other plant mites, with no particular differentiation 
of broods. 
