they are situated, in the males, have the inner margin prolonged; the 
inner margin of the first joint advanced or gibbous, but not toothed. 
Honey-tubes rather long; tail about one-third the length of the 
honey-tubes. 
There is really no necessity for this genus, and it ought to be sup¬ 
pressed. 
Myzus cerasi. Fab. The cherry-tree Aphis. 
This is another introduced species of this numerous family, and, 
like most of the European or Eastern insects which have been intro¬ 
duced into this country, appears to thrive equally well, if not better, 
than its congeners, as it is in some sections the most common and 
abundant species. Goreau describes the species found in France as 
averaging a little less than one-tenth (.08) of an inch in length; 
body black; antennge black; with the middle portion yellowish; abdo¬ 
men black; legs black, the tibiae pale yellowish; wings pellucid. 
Found on the under side of the leaves of the cherry-tree, which they 
roll and crisp. 
As seen in this country, the wingless female measures about five or 
six hundredths of an inch in length, the winged individuals measuring 
to the tips of the closed wings, rather over one-tenth of an inch. 
The winged female is of a shining black color, the abdomen is nearly 
twice as broad as the thorax, giving it an ovoid or egg-shape, with the 
smaller end in front, which is more clearly shown iD the wingless in¬ 
dividuals; antennae black, about three-fourths the length of the body; the 
beak short, black or dusky; legs black except the basal half of the 
thighs and the basal portion of the tibiae, which are pale or whitish; 
wings pellucid; the base, outer margin and rib-vein, white; remaining 
v^ins usually dusky; the second vein is about a third farther from 
the first at its tip than at its base. The honey-tubes long cylindrical 
and black; tail one-third the length of the honey-tubes. Sometimes 
the abdomen is clouded with yellowish green. 
The wingless females agree very nearly with the above, so far as 
relates to the body. The antennae are whitish, except the two basal 
joints and apical half; beak, whitish, with the tip only black; legs 
white; feet, tips of tibiae and tips of thighs, black. The abdomen has 
an elevated lateral margin. 
The young larvae are at first dull white or pale yellow, but grow 
darker as they increase in age. 
This infests the leaves of the cultivated or garden cherry-tree ( Cerasus 
vulgaris ), to the varieties of which it appears to be exclusively confined. 
They hatch out in the spring as soon as the leaves begin to unfold. 
There are a number of broods produced in the same manner, and sim¬ 
ilar in habits to the other species of the genus; although the summer 
broods appear to be exclusively females, among them we often find 
winged individuals. They often become very numerous, covering the 
under side of the leaves with their colonies, and sometimes piled one 
upon another. Dr. Fitch states that in 1855 the leaves of his cherry 
trees were literally covered with these lice; that at the time they w T ere 
most abundant he made an estimate of the number on a single small 
tree, but ten feet high, and was astonished to find this to be at least 
twelve millions. 
