CLEAR-WINGED MOTHS. 55 
in which it passes the winter; here it eats extensive cavities. 
As soon as the warmer weather indicates the advent of 
spring the worm becomes active again and enters another 
cane, where it feeds for some time. When full grown the 
worm prepares an opening for exit, as the moth has no 
mouth to do so and would otherwise die a prisoner. At 
this time the larva measures about an inch and is of a_vel- 
lowish-white color with a dark brown head and a few shin- 
ing dots on each segment of the body. Near the place of 
exit the larva changes to a pupa and when the time arrives 
for the moth to escape the pupa wriggles itself forward by 
means of fine spines encircling the segments. Soon after the 
moth appears, leaving the empty shell of the pupa sticking 
out of the cane. 
The canes infested by such worms invariably die. But 
little can be done to prevent the damage to our raspberry 
canes as the worms are so well hidden, and the only method 
we have to lessen the evil is to remove ali old canes and all 
others that are not in a thrifty condition. 
THE GRAPE-VINE ROOT-BORER. 
(Sciapteron polistiformis Harr.). 
This fine insect is much larger than the one just de- 
scribed, measuring with expanded wings fully an inch and a 
half across, It is very uncommon in Minnesota, and but a 
single specimen was seen in 1898 flying about the wild 
grape-vines on Gray Cloud Island. The moth resembles 
one of our large paper-wasps (Polistes), and on that ac- 
count was named ‘‘ Polistes-shaped.’’ The sexes vary, the 
male having toothed antennez, while those of the female are 
simple. The male has thorax and abdomen darker in color, 
and has also in addition to the short pencils of orange hairs 
on the lower side of the abdomen two longer ones above. 
There is a bright yellow band on the base of the second 
abdominal segment and usually another one on the fourth, 
