GRAPE MANUAL. 27 
[Under side of Leaf covered with Galls.] 
dredth part of an inch long, and not quite half as thick. 
She is sbout st inch long, of a aud ‘orange color, and 
lane. The e eggs begin to hatch, when six or eight 
days old, into active — phetnet 
thei 
= these bap lice scatter over 
ine f them finding 
a iy the aaa terminal 
eh and com e pumping 
oO and appropriating the sap, 
> forming galls and stra Pt eggs, 
a‘ 
HATCHED LARVA;] a, 
b 
© [NEWLY 
ventral; 5, dorsal view. |. 
ate. Itis an important fact that the gall-inhabit- 
ing insect occurs only as an agamic and apterous female 
form. Itis but a transient summer state, not at all es- 
sential to the perpe 
[MorHER GaLt-Louse; ventral few of its 
and dorsal views ] been noticed on 
5 and abortive attempts are often sinks 
to found them on others. And in some seasons it is 
even _— find a few galls on the very vines on 
which they w e very abundant the -_ before. 
wire aps 
h the 
from the ground while in the pupa state, they rise in 
the air and spread to new vine- 
yards, where they deliver them- 
selves of their issue in the form 
these 
eggs which are probably depos- 
ited in the crevices on the su 
face of the groun nd, near the 
base of the vine, spenoes wd 
sexual individuals, 
[MALE PHYLLOXERA; t 
Ventral View. 
or of taking food. ey are silti active and couple 
readily. 
Every piece of root having rootlets, taken from an 
infected vine during August or September, will present 
some 2 re winged fe 
gather on the side of the jar toward the light. We may 
i m this fact of the immense number 
that disperse through the air to new fields, from a single 
acre of infected vines in the course of the late summer 
[Type RaDICICOLA; showing the tubercles by 
which it is distinguished 5 Gallicola.] 
and cies months. owe have, therefore, the oo of 
an 
: 
ued existence, even when confin ed t 
It spreads in the wingless state from vine to 
vine and from vineyard to vineyard, when these are 
jace ith rough passages in th nd i 
the same time it is able in the 
_ condition, to migrate to much more distant 
points. 
if ies the above account we add that occasionally in- 
