116 
pear about the first of October. The body measures about one-fourth 
of an inch in length; to the tips of the wings about two-tenths. They 
are without the conical projection, or stylet, found in most of the 
species already described, at the tip of the abdomen; the honey-tubes 
are much shortened. The body is black, and the abdomen is without 
dots which are so often present in this genus. The wings are pellu¬ 
cid, but the veins are yellowish, as are the legs, the honey-tubes and 
the first joint of the antenna?. As in the following species, when 
crushed it gives out a stain of reddish or deep orange color, showing 
such a strong resemblance to that species in this respect, as well as 
in its habits, that were it not for the marked differences in coloration 
and size we should not hesitate to consider them as but varieties of 
one species, which further evidences may yet prove to be the case. 
Lachnus dentatus, LB. (Fig. 18). The Spotted Willow. Aphis. 
As Dr. Le Baron—-who first named this species—-has already des¬ 
cribed it in his Second Report, it will be unnecessary for me to do 
more than simply mention some of the chief characters as there given, 
as I have nothing to add to what he has said. 
Fig. 18. 
A 
rL 
It is found in October and November, in 
colonies, on the under side of the branches 
of the gray willow; and occasionally, but 
apparently accidentally, on trunks of small 
nursery apple trees. The winged individ¬ 
uals measure about one-sixth of an inch to 
the tip of the abdomen; the wings expand¬ 
ing about half an inch. Black; abdomen 
dark and ash color, with six transverse rows 
of black dots. Antennae as long as the head 
- « • i -i • i • 
and thorax. Front wings with a very long stigma; the third vein 
withtwo forks, as usual in this genus. Honey-tubes reduced 
to mere tubercles. Thighs dark honey-yellow, broadly tipped 
with black; tibiae dusky reddish at the base. The dots on the abdo¬ 
men are very distinct in the full grown individuals, the intermediate 
rows have six dots in a row. Just behind the middle of the abdomen 
and occupying the place of the two middle dots in the fourth row, is jj 
usually a somewhat conspicuous, black, conical protuberance. V\ hen 
crushed they stain the fingers red. 
The cross at the top of the figure represents the natural size of the 
insect when the wings are opened; the bent line to the right is a 
crude representation of an antennae enlarged. 
Lachnfs cary.e. Harr. The Hickory Plant-louse. 
This is the Aphis car yen of Harris, and is found on the pig-nut 
hickory (Cary a. porcino), clustered on the underside of ,the limbs in 
summer. It is perhaps our largest species, measuring one-fourth of an 
inch to the tip of the abdomen, and above four-tenths to the tips of 
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