Normal on the pear. As the persimmon is unknown in this vicinity, 
the species doubtless occurs on other trees. We have not found it 
however, upon cultivated fruits in numbers to indicate any proba¬ 
bility of injury to them. 
This species is larger than that just described, shining black, 
more or less pubescent, especially upon the head and thorax. The 
frontal lobes are short, very obtuse and project forward from the 
vertex. 
It is probable that Trioza pyrifolia , like Psylla pyri, winters a< 
an adult and lays its eggs upon the young leaves m spring. The 
young of the common species fix themselves habitually upon the 
young twigs or wood of the previous year, and, piercing the still 
soft bark with their long beaks, remain stationary except when dis¬ 
turbed. The fluid excrement of the louse attracts ants and other 
syrup-loving insects, as does that of the Aphis. As the larvae obtain 
their growth, they spread to the under sides of the leaves. Where 
these insects are abundant, the continual drain upon the sap of the 
young twigs arrests their growth, and the tips of the leaves and 
twigs may die. 
The various insecticides found available for plant lice take effect 
likewise upon these jumping leaf lice, the most promising topical 
application doubtless being the kerosene emulsion with soap. 
8. The Willow Saw Flies. 
(.Dolerus arvensis, Say; Dolerus bicolor, Beauv.) 
Order Hymenoptera. Family Tenthredinule. 
(Plate X. Fig. 7.) 
From one of the most intelligent and observant fruit growers of 
my acquaintance, I have heard from time to time of a “steel-blue 
fly” which clustered in spring upon the buds and blossoms of the 
pear, either eating them or blighting them and causing them to 
drop. On the 80th March he sent me specimens from his pear 
trees, and I found them to be the adults of the above two species 
which are known as willow saw flies,—so-called because their [ reen, 
many-footed larvae feed on the leaves of willows. The evidence 
against these saw flies lay in the fact that they were abundant and 
busy upon the opening buds and fresh blossoms of the pear and oi 
some other trees, for many days in succession, and that the blos¬ 
soms afterwards fell without setting fruit. Afterwards a similar 
but more positive charge against these insects appeared m tlie 
correspondence of the “Western Bural’’ of Chicago, for Ma} c 
1884, as follows: 
“Enclosed you will find a couple of bugs that are working on 
fruit trees here. They ruin many blossom buds by sucking the sap 
out of them, sometimes causing them to fall off just before opening. 
They make their appearance as soon as the trees begin to g r0 • 
