CLEAR-WINGED MOTHS. 57 
In several instances the roots of very small plum trees 
growing in a nursery were destroyed by a similar larva 
which had to live outside of these roots as these were quite 
small. Considerable damage was caused by the worms, 
but as none could be kept alive in confinement it is 1impos- 
sible to state to what species these destructive larve be- 
longed. Infested roots are shown in Fig. 60, Plate [X. 
THE PEACH-TREE BORER. 
(Sannina exitiosa Say). 
This is a notorious pest and very destructive to peach 
orchards. It isa pity that it is not found in our State, as 
its presence would indicate that we possessed a clime warm 
enough to successfully grow the succulent peach. Still some 
peach trees are grown and succeed in Minnesota, and with 
proper protection it is by no means impossible to grow this 
fruit. Perhaps the insect mentioned above as being injurt- 
ous to the roots of plum-trees is this very species, as the 
peach-tree borer works also upon the plum. In fact, as this 
insect is a native one, it had in former times to feed upon 
something else than the peach-tree, as this comes from 
Persia. 
The adult msects appear in the Northern States and 
Canada from about the middle of July to the end of August. 
The sexes differ very much. The female is much larger than 
the male, with a broad and heavy abdomen; her body is of 
a glossy, steel-blue color with a purplish reflection, and a 
broad band of orange-yellow crosses the abdomen. The 
fore-wings are opaque and similar to the color of the body; 
their tips and fringes have a purplish tint, both above and 
beneath. The hind-wings are transparent and broadly mar- 
gined with steel-blue. The wings expand about an inch and 
ahalfacross. ‘The smaller male, measuring not more than 
