836 
[Assembly 
half way to the tip and are dusty at least at their ends; the neck and lower side of 
the head are green; the antenna; are two thirds of the length of the body, dusky, 
and in young individuals green at their bases; the beak is short, pale green, its apex 
blackish; the legs are dull white, the feet and four hind thighs except at their base, 
blackish; the wings are pellucid, the stigma salt white margined with dusky, more 
widely so on its inner side, the veins black, the rib-vein white, the second fork very 
short. 
The wingless females are 0.08 long, egg-shaped, pale yellowish green, their abdo¬ 
mens coated with a white meal-like powder except at the sutures and on the medial 
line, which last is deeper green, and the legs and antenna; dull white. 
The larva when young are pea green with white antenna;, nectarids and legs. 
When older a deeper green stripe appears along the middle of the back and a row of 
deeper green spots each side which are more or less confluent into stripes. 
The aphis upon our garden cherry is the species which is named 
Aphis Cerasi by Fabricius. It undoubtedly has been introduced 
upon this side of the Atlantic with the tree which it Infests. M. 
Fonscolomb (Annals Ent. Soc. x. 173), speaking of this species 
in the southern part of France, says it occurs the last of July, 
and that he has never met with any winged individuals. This 
would indicate the species to be much more rare than it is with 
us. Here from the middle of May till the last of September it is 
the most common of any species of this family. For years when 
I have wished to investigate any fact in conuectian with the 
aphides I have turned to this species, always finding it at hand, 
and always with two or three winged individuals upon every leaf, 
m company with larvae, pupae and wingless females. 
The larvjs when newly born are about 0.03 long, of a dull white or pale yellow 
color, with transparent and colorless legs and antennae They are of an oblong oval 
form, with the opposite sides of their bodies parallel and their nectaries shorter than 
to the tip and transparent or slightly dusky. As they become larger they are broader 
across the abdomen and deeper yellow, the tips of the antenna; and the feet dusky 
and the nectaries black. After casting their skins they are dull reddish brown or 
chestflut colored with black heads, and are much broader across the abdomen, being 
now shaped like an egg and measuring 0.05 in length. Their legs, antenna; and nec¬ 
taries are whitish trarsparent, the last equalling the tip. Others of this same size 
and form have the thighs, feet, nectaries and tips of the antenna; dusky. 
The wingless females are 0.06 long, with very plump broad egg-shaped bodies, 
which are black and shining, with a slightly projecting tail, the nectaries equalling or 
even surpassing its tip and of a black color, the antenna; shorter than the body 
and whitish, their two short basal joints and the apical half black; the beak whitish 
with a black tip; the legs white with the feet, tips of the shanks, and coromonlly the 
