12 
bands. It is found upon the branches of peach and plum, more rarely 
on apple, and commonry occurs on the under side of the branch, the 
upper side of which is covered with a black fungus that grows on the 
honey-dew dropped b} T the Lecaniums from the branch above. The 
females pass the winter in the adult condition. The eggs are developed 
b}^ the latter part of May. The young hatch early in June and con- 
tinue for fully a month (June 10 to Julj T 15). The young larvas are 
flat, uniformly pale yellow, and with a thin marginal rim. They become 
stationary in a few weeks. By the middle of July the male pupee are 
deA^eloped, and by the 22d the first winged males appear. There is but 
one brood a year, and the best time for treatment will be during July. 
Fig. 1.— Lecanium nigrofasciatum Perg.: aduKs at left, young at right. (Howard). 
There is another species of Lecanium (Z. prunastri), less commonly 
found on plum. The female is much like that of the peach Lecanium, 
but the insect passes the winter in the larval state, not maturing till 
May. The young hatch in July, migrate to the leaves, and in the 
early fall return to the branches, where they pass the winter. It has 
rarely been found in this country outside of New York State. 
THE OYSTER-SHELL BARK-LOUSE. 
| Mytilaspis pomorum Linn. — figs. 2 and 3.) 
The oyster-shell bark-louse is one of the best known enemies of the 
orchardist. It is a dark, slightly convex scale, elongate and usually 
curved in outline, much resembling a miniature oyster shell. When 
crowded upon the tree they are apt to he less curved and often quite 
straight. The elongate exuvium is situated at the small end. Its 
elongate shape and dark color at once separate it from all other com- 
mon orchard scales. The eggs, which are whitish in color, are deposited 
in late summer, and occupy the posterior two-thirds of the scale. The 
female dies, but the scale remains to protect the eggs during the 
winter. The young hatch in May or early June, crawl out upon the 
