AVhen very numerous, this species does not confine itself to the 
. leaf alone, but extends its colonies to the stalk, and even to the ten¬ 
der twigs, and buds, and fruit stems, and occasionally to the green 
fruit. The tough, rigid texture of the cherry leaves prevents them 
from becoming wrinkled, like those of some other trees; but the mar¬ 
gins curl, and there is a tendency to curl backwards. When they at¬ 
tack very numerously the twigs and young leaves, the extraction of 
the sap causes them to shrivel and die. This species is quite common 
in Illinois, and according to Walsh, has been observed on the plum; 
but this fact appears somewhat at variance with the fact that it will 
not develope on any species of the cherry except the one mentioned. 
Since the previous sentence was written this specie^ appeared here 
(18?8) in great abundance, numbers covering the twigs and axils of 
the small, limbs of both young cherry and plum trees; showing that 
Walsh was correct. I suggested a means of destroying those on the 
small trees, but before it was tried, copious rains, or some other cause, 
suddenly swept them away. 
Myzus persicle. Sulzer. The peach-tree Aphis. 
This is also an imported species. It lives on the underside of the 
leaves of the peach-tree, causing them to thicken and curl, forming 
hollows beneath and corresponding crispy swellings above, and causing 
them ultimately to perish and drop off prematurely. 
The winged female —Is very variable in color, some to the naked 
eye appearing quite black, whilst others are brown, olive brown or 
greenish black. The honey tubes slender and cylindrical; tail pointed 
and black. The third joint of the antennae sometimes tuberculated. 
Beak reaches nearly to the insertion of the third pair of legs. Length 
of body .08 inch; to the tips of the wings .1*8 inch. 
Wingless females.— Ovate, rusty red; head broad, and the antennal 
tubercles enlarged on the inner side. Antennae legs and honey tubes 
greenish; honey-tubes long and cylindrical. 
Winged male.— Bright yellow. Head, band on the front or protho¬ 
rax and some transverse streaks on the back, brown. Eyes red; honey- 
tubes black; tail small and black. 
It is common on the nectarine as well as the peach, and is round 
from May to October. 
Myzus ribis. Linn. 
