538 GRAPE DISEASE. 
from the ground perhaps as early as July. When I last examined — 
the roots before my departure, or about the middle of May, no 
pup were found; but winged insects were obtained as early as 
July in France, and after my return I had no difficulty in ob- 
taining all I wished, especially during the latter part of Sep- 
tember. The pupz are easily recognizable with a good lens, by 
the little dark pad-like wing-sheaths at the sides of the body — 
(Fig. 129, e, f)—and the sexes may even be distinguished at this 
stage by the greater constriction of the body near these pads in 
the female, compared to the male, her abdomen being larger. 
Before giving forth the winged insect, these pupæ become quite 
restless and active, and in a state of nature they no doubt issue 
from the ground. : 
The winged female (Fig. 129, g, h) seems to be much more 
common than the male, and is distinguished by her more length- i 
ened abdomen — the wings, when closed, extending not much a 
more than its length beyond the tip, while in the male they extend ae 
more nearly three times its length. ‘The dusky thoracic band is . 
not so distinct and the abdomen is more produced at the oe a 
the male; and there is also a slight difference in the venahon of 
_ the wings of the two sexes, which venation is best seen " ¢ 
= fresh specimens, as it becomes in a measure obsolete in cre : 
In the abdomen of the female two or three large eggs are plainly 
visible, especially after being soaked in acetic acid. The ei zi 
jointed tarsus or foot is also plainly visible in such specimens, ©” 
I have found the joint movable, while M. V. Signoret, of wee 
has obtained the skin of the tibia or shank with the we 
of the tarsus hanging to it. Prof. Westwood also refers to y aie! 
basal tarsal joint in the gall insect which he described. er 
SUSCEPTIBILITY or DIFFERENT VINES TO THE A be 
Lovse.—I have carefully examined a great many diffe 
of vines within a circuit of thirty miles of St. Louis, ee 
Cole, Jefferson and Boone counties, in this State, and ae 
mary which follows indicates the susceptibility of the ‘ 
varieties to this disease. There may be objection Ki ee Le 
some persons to the placing of some of the varieties "i 
lowing tables and the opinions both of botanists and vine 
