133 
fc'ki. ... 
I they could not be traced to the outlet, but on several occasions 
,ve seen the anterior ovum forced through this opening by the 
sure of the cover-glass. 
The eggs are attached singly to the walls and 
hairs of the cecidii. They are slightly depressed, 
nearly spherical, and those I have seen were light 
yellow in color. Two examples of these eggs from 
2 q_Fo-p- the ? reen ash measure .001 inch in diameter, and 
>pt»s quadripes, as mm from soft maple .C02 inch in diameter. The 
if a ga!ii t0 on h6 the dev , el ?P in g mite may be seen in some of the eggs, 
3 of the soft maple an ^ in one of those observed by the writer the 
dasycarpum). . two pairs of legs and the abdominal stride ap¬ 
ed much as m adults. 
le young mite, fresh from the egg, is very helpless. Several 
s or the skm take place before it is mature, and many of 
) molting young may be found by washing out a cecidium 
r ig their period of most active growth. At each molt there is 
iriocj of inactivity, during which the mites lie encased in the 
* old skm. _ Landois claims to have observed four molts, the 
; occurring just after the mites leave the eggs, when the tarsal 
ndage appears; at the second there is only an increase in size; 
3 at the third, the first and at the fourth, the second pair of foot 
P® appeals. One of ihe smallest young I have seen measured 
inch m length, the adult from the same cecidium measured 
inch m length. 
HABITS. 
e mites move about quite rapidly, when their size is taken into 
'.deration, depending mainly upon the short legs for locomotion, 
u s ^ys that they also move in the same manner as the larvae of 
aemdae, the terminal sucker playing the part of the false feet, 
ve not witnessed this movement, but can easily believe them 
tC u- r 2° ve - as d escr ibes. The sucker seems to me to be 
chiefly m clinging; and is doubtless of service to the mites 
•eventing the weight of the long abdomen from pulling them 
the under side of the leaves upon which they may be 
>ing. While watching the mites at home in a nook of a gall 
ud, I have sometimes seen them attach themselves by the 
3 r and swing the body about into a new position. The sucker 
hold on whatever it touches, and the mites themselves are 
times seized upon by their neighbors and dragged about by it. 
apti hibernate in the perfect state during the winter, and while 
them may descend to the ground for that purpose, as is 
osed by Dr. Shimer and others, all of them certainly do not 
>, for I have been able to obtain mature and active specimens 
twigs at any time during the winter by bringing them into a 
.i room, and at times from a temperature but little above zero F. 
SPECIES. 
die I am alive to the possibility that a species of Phytoptus 
have a wide range of plant food, and produce very different 
y 
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