PINE SCALE-INSECTS. 
805 
144. Psylla tripuncta Riley. 
A pretty reddish or pale brown species ; spun on leaves April 4, 1883 ; wings with 
three broad brown stripes ; an oblique stripe in middle of wing. 
Professor Riley states that Psylla tripuncta is "very common on pine 
trees from Canada to Florida" (Amer. Ent., fig. 17, p. 62). 
145. Pine-leaf chermes. 
Chermes pinifolice Fitch. 
Order Hemiptera ; family Aphid^e. 
Stationary upon the leaves, usually towards their ends, puncturing them and suck- 
ing their juices, a very small black fly 0.08 long to the tip of its abdomen, and 0.12 
to the end of its wings, which are dusky gray, its abdomen dusky red and slightly 
covered with fine cottony down. (Fitch.) 
" The females of these insects do not extrude their eggs. Clinging 
closely t© the leaf with their heads towards its base, they die, their 
distended abdomens appearing like a little bag filled with eggs. The 
outer skin of the abdomen soon perishes and disappears, leaving the 
mass of eggs adhering to the side of the leaf, but completely covered 
over and protected by the closed wings of the dead fly. I have met 
with the dead females thus adhering to the leaves the first of July, and 
have noticed the same insects on the leaves in full life and vigor the 
middle of May." 
The rib vein of the forewings runs straight to the outer margin forward of the tip, 
and gives off from its middle on the outer side a very oblique branch which runs to 
the outer margin, its tip producing a slight angular projection of the edge of the 
wing, and the whole space on the outer side of the rib vein beyond this branch is more 
opaque than the rest of the wing and of a smoky yellowish color. From its inner side the 
rib vein sends off three simple oblique 
veins, the last one of which ends in 
the extreme tip of the wing. The 
hind wings have an angular point 
on their outer side beyond the middle, 
and a longitudinal rib vein, which, 
forward of its middle sends off a 
branch almost transversely inward, 
its tip curved backward. The an- 
tennae are short, thread-like, and com- 
posed of four or five small joints. It 
will hence be seen that this insect 
is a true Chermes — the first species of 
this genus that has been discovered 
in this country. (Fitch.) 
146. The pine-leaf scale-insect. 
Mytilaspis pinifolice (Fitch.) 
Order Hemiptera; family Coccid.e. 
Fig. 274.- 
leaf: 
Fixed upon the sides of the leaves 
of young trees, exhausting them of 
their juices and causing them to turn yellow 
a pale yellow spot upon their pointed end. 
-Pine-leaf scale-insect ; a, natural size on pine 
l, male ; c, d, female scale. After Riley 
; small oblong flattish white scales, with 
(Fitch.) 
