LEPIDOPTERA. 
26l 
differ greatly in appearance. The general color of both 
sexes is a glassy steel-blue. In the female (Fig. 306) the 
fore wings are covered with scales, and 
there is a bright orange-colored band 
on the abdomen. In the male both 
pairs of wings are nearly free from 
scales. No better method of fighting 
this pest has been found than to care- FlG * ^ o6 -— Sanmna exitl0Sa - 
fully watch the trees and remove the larvae with a knife as 
soon as discovered. 
The Pacific Peach-tree Borer, Sannina pacijica (S. pa* 
cif'i ca).—On the Pacific Coast there is a peach-tree borer 
that is distinct from the above, and appears to be an even 
more serious pest. The larva is more difficult to remove 
from the tree, as it bores into the solid wood. The female 
of this species lacks the orange-colored band on the abdomen. 
The Currant Borer, Sesia tipuliformis (Se'si-a tip-u-li-for'- 
mis).—This species is closely allied to the two preceding, 
but is smaller, expanding only about three fourths of an 
inch. There are but few scales on either pair of wings 
except on the tip and discal vein of the fore wings and the 
outer margin of the hind wings. The eggs are laid on the 
twigs of currant. The larvae penetrate the stem, and de¬ 
vour the pith; in this way they make a burrow in which 
they live and undergo their transformations. The perfect 
insects appear in June. Before this time the leaves of the 
infested plant turn yellow. If such plants be cut and burned 
in May the pest will be destroyed. 
The Pine Sesian, Harmonia pini (Har-mo'ni-a pi'ni).— 
Frequently there may be seen on the trunks of pine-trees 
large masses of resinous gum mingled with sawdust-like 
matter. These are the results of the work of the larvae of 
this insect, which bore under the bark and into the superficial 
layers of the wood. The adult resembles the female of the 
Peach-tree Borer, but the abdomen is more extensively 
marked with orange. 
