ADDITIONAL INSECT ENDMIES. 135 
fine silvery scales rub off easily from its body, which is 
an inch long. The white fore wings spread two anda 
half inches. The darker hind wings spread a little over 
two inches. The antenne are pectinated, and about 
half an inch lor.g. Very destructive in Australia. 
Remedy.—TVhey are said to be attracted by light in 
the evening, and when caught may be easily killed. 
THE Frvuit-BaArK BEETLE (Scolytus rugulosus, Ratz.). 
—Fig. 121 is a very small but destructive beetle, that 
attacks the plum, pear, peach, apple and quince. Weak 
and sickly or injured trees are, or have been supposed te 
be, its choice; but vigorous, 
healthy trees are destroyed by this 
pest. It attacks the branches 
and twigs as well as the trunk. 
The beetles are very minute, dark 
brown, cylindrical in their gen- 
eral form, with wing-covers hay- 
ing small punctures between the 
grooves. The thorax is also 
punctured. The head is verti- 
cel, with short, strong jaws, and 
autenne short and strongly - .couvcus RvGuLUsUS. 
clubbed. It is about one-tenth (Zuarged twenty diameters.) 
of an inch long, and one-third as wide. The white 
larya has a small brown head, and is transversely wrin- 
kled, footless, and is as long as the beetle it produces. 
The adult comes out in May, and fresh burrows are 
formed as late as October. ‘*The female perforates 
the bark, and, after pairing in the anterior part of her 
nearly vertical breeding chamber, burrows longitudinally, 
laying eggs to the right and left as she progresses. The 
larve eat laterally outward, forming nearly straight 
channels, furrowing the sapwood more or less, unless 
the bark be thick, and forming finally a pupal cliaamber 
in the wood,” from which tue matured Leetles escape 
