827 
No. 145.1 
indicates the European species to be distinct from ours, which 
has a smooth shining thorax not in the least coated with any meal¬ 
like matter. > 
This aphis is much less common than those which pertain to 
our other fruit trees. Its generation and habits are so similar to 
those of the Apple plant louse that a separate account would be 
little more than a repetition of what has already been related. 
It only remains, therefore, to give a description of this species in 
its larva and its perfect states. 
The Larva when first hatched is of a white color, the body slightly tinged with 
green, the feet, tip of the beak and eyes black. As it increases in size three stripes 
of a deeper green begin to appear and become more distinct and are finally of 
a bright green color. One of these stripes extends along each side of the thorax 
and abdomen, and has in it on the thorax a large deep green dot, and upon the abdo¬ 
men two or three less deeply colored dots; the third stripe is on the middle of the 
abdomen and is not extended to the thorax. The body has now become of a green 
ish white color, the legs, nectaries, antenna: and beak white without any tint of 
green, and somewhat pellucid. The tip of the beak, the ends of the feet and the 
eyes are black. It is of an oval form, and measures 0.06 in length by 0.03 in width. 
The Winged Plum Leaf-louse is 0.14 long to the tip of its wings. It is black 
and shining, its abdomen pale green with a black dot on each side of the middle of 
the two or three anterior segments, a large dusky spot rather behind the middle, 
and a short dusky band between this and the base; tip of the abdomen acuminate; 
nectaries cylindric, equalling the tip. The legs are pale yellowish, the tips of the 
thighs and the feet dusky or black. The antennae are black, their b^ses pallid. Th 
wings are pellucid, their veins slender, blackish, the rib-vein and base of the third 
vein pallid; inner margin with a black line extending inwards from the apex of the 
first vein. The veins are analogous to those of A. Pruni in their relative distances, 
except as already noticed; they, however, vary so much that it is seldom an indi¬ 
vidual occurs having them normal in both wings. The third vein is as near the 
second at its apex as at its base, oftener than it is more distant. 
The following are some of the varieties which may be met with among individu. 
als of this species: 
a. Abdomen above deep black and shining. 
b. Abdomen pallid whitish; tips of the thighs and veins of the wings dusky, not 
black. 
c. First fork at tip as far from the tip of the second fork as from the third vein, 
d. First fork at tip much farther from the tip of the second fork than from ti e 
third vein, the cell between the first fork and third vein narrower at its base. 
