INSECTS INJURIOUS TO THE APPLE TREE. 
THE WHITE-MARKED TUSSOCK-MOTH. 
( Orgyia leucostigma , Smith and Abbott.) 
Order of LEPIDOPTERA. Family of Arctiidhs. 
Harris’s Treatise, State Ed., page 366 ; Fitch’s 1st and 2d New York Reports, p. 209 ; 
Riley’s 1st Missouri Rep., p. 141. 
There is no noxious insect which I have received from so many 
different localities during the past summer, as the pretty caterpil¬ 
lar, which is the larva of the above-named moth. It is easily 
recognized by its coral red head and neck, and two tubercles of 
the same color, on the ninth and tenth rings. There are lour 
short, thick, brush-like tufts on the fourth and three following 
riDgs, varying in color from cream color to yellow, and three long 
pencils of black hairs projecting one on each side of the neck, and 
the other from the top of the eleventh ring. It is figured on plate 
seven, of Harris’s Treatise, fig. one; and there is a better figure 
on the 145 th page of Mr. Riley’s first Missouri Report, a copy of 
which is given at the head of this article, and also a figure of the 
male of the moth which proceeds from it. This insect has always 
been described as an exclusively leaf-eating caterpillar, but in 
