106 
Callipterus has really no characters. But as I have elsewhere stated 
the present restricted genera of the Aphides are largely artificial and 
must remain so until the life history of the species is better known. 
I use the genus here in a slightly different and more districted sense 
than its author, who brings together here Aphis coryli. Kalt and 
Chaitophorous ononedis. Kalt. The former which he gives as the 
type I take as a guide; the latter is evidently a species of Chaitophorus. 
His Pterocallis is dispensed with and the species which would be 
placed in it are referred to Callipterus. 
The characters may be given as follows: Front wings with the 
third discoidal vein twice forked; posterior wings with two discoidal 
veins; antennae not on a tubercle, smooth, seventh joint longer than 
the sixth; honey-tubes tuberculiform or sub-obsolete.. 
Very closely related to Callipterus , and from which it is chiefly 
separated by the comparative length of the sixth and seventh joints 
of the antennae. 
It would probably be as well or perhaps better to refer the species 
of this genus to Callipterus. 
Myzocallis bella. Walsh. 
Syn. Myzocallis guercicola. Thos. Mss. 
Apthis bella. Walsh. 
f \ | • 
The following species of plant-louse is described from specimens 
found by Prof. Bundy in Wisconsin, and by myself in Illinois. It 
is possible the two are not identical, but as they appear to be, I de¬ 
scribe them as such, giving the description of both, that the reader 
may be able to determine for himself. 
Specimens from Prof. Bundy: v 
Winged individuals. (Alcoholic and somewhat imperfect).—Body 
somewhat fusiform in outline, honey-tubes very short, the length but 
little more than the diameter; slightly swollen at the base. 
Antennae wanting in all the winged specimens. Wings, with third 
discoidal vein of the front pair, twice forked; posterior pair with two 
branch or discoidal veins. In the anterior pair the first vein is about 
twice the distance from the second that the second is from the third, 
and curves regularly though slightly inward as it approaches the mar¬ 
gin of the wing; second vein very distinctly sinuate; third vein 
slightly sinuate also. Second fork of the third vein about equally dis¬ 
tant from the apex and from the third vein. The fourth, or stigmatic 
vein curves sharply the first half of its length, and then runs straight 
to the margin, but diverging somewhat rapidly from the fork of the 
third vein. Stigma acutely pointed at the apex, very obtusely angled 
posteriorly at the point where the fourth vein arises. 
General color of those specimens which have been immersed for a 
long time in alcohol, pale, dull yellow; the abdomen shows some par¬ 
tial, transverse, dark stripes on each side. Wings very thin, trans¬ 
parent, the veins dark brown, slightly margined with brown, which 
expands at the points where they reach the margin, giving the wing 
a very pretty appearance when seen through an ordinary pocket mag- 
