PLANT-LICE OF THE OAK. 209 
294. Drepanosiphum f quercifolU (Walsh). 
Larva. — Pale greenish. Incisures of the antennae dusky. Upper surface of the 
body, except the scutel, dusky ; houey tubes long, robust, dusky at tip ; legs long, 
with the terminal three-fourths of the femora, the extreme tips of the tibiae, and the 
tarsi obfuscated. 
Imago — Blackish ; prothorax and anterior part of the thorax sometimes varied with 
greenish ; scutellnm pale greenish ; houey tubes two-thirds as long as the femora. 
Legs very long ; basal half of femora pale greenish. Wings hyaline ; veius brown; third 
discoidal vein hyaline at its origin ; stigma and subcostal veins pale yellowish 
brown ; extreme tip of the front wings slightly fumose ; length of the wings scarcely 
.2 inch. "The anten lae attain the extreme tips of the wings when the wings are ex- 
panded, and the stigma is four times as long as wide and very acute at each end. 
On oak leaves." (Thomas.) 
Although it is impossible to state positively from this description the 
genus to which this species belongs, yet I think it is almost certain that 
it should be placed in the genus to which I have assigned it. It is 
certainly not an Aphis, in the restricted sense, and the plant it infests 
would indicate that it is not a Siphonophora. (Thomas, Third Keport.) 
293. Myzocallis bella (Walsh). 
"Aphis bella.— Oak leaves? Bright yellow, eyes black; antennae with the tips of 
joints 3 to 6 black. Prothorax as long as the head, with a lateral black vitta ; thorax 
with a black vitta extending from its anterior angle to the base of the front wing. 
Honey tubes scarcely as long as the tarsi, generally immaculate, sometimes tinged 
with fuscous. Legs long, black except the base of the femora and the coxae. Wings 
hyaline ; front wings with the entire costa as well as its nervures black to the tip of 
the stigmas, whence there extends a marginal dusky vitta, as wide as the costa at 
base and middle but tapering at tip, nearly as far as the middle branch of the third 
discoidal vein ; this vitta covers the entire length of the fourth or stigmatal vein, 
which terminates half way between the tip of the stigma and the apex of the wing, 
is slightly and gradually curved, and incloses a marginal cell not wider thau the 
costa; hind wings with a costal dusky vitta extending to the tip of the wing, the 
subcostal vein sometimes black ; remaining veins of both wings slender and pale 
dusky, narrowly bordered with subhyaline where they traverse the terminal dusky 
vitta of the front wing. Length to tip of wings .15 inch. 
"The antennae attain the middle of the stigma when the wings are expanded, 
and the stigma is rather more than three times as long as wide, not very acute at 
each end." (Walsh.) 
" The 22d of May, 1878, I discovered, at Carbondale, Ills., on the 
leaves of the burr oak (Quercus macrocarpa), plant lice, which I am 
inclined to believe belong to the species just described. In order that 
the reader may be in possession of all the facts concerning the species, 
I add here a description of these specimens : 
" Winged individuals (the only kind seen). — Rather slender, of medium size; the 
body and all the parts except the wings a pretty creamy yellow color ; the wings thin 
but clouded with fuscous, which is very distinct in the living insect, while the wings 
stand erect above the abdomen ; these fuscous or cloudy spots appear to fall chiefly 
into two irregular oblique bands, one rather in advance of, and the other behind the 
stigma, but when a single wing is examined this arrangement will scarcely be 
observed. Costal and subcostal veins of the front wings close together, and parallel 
throughout ; second discoidal vein decidedly sinuate and much nearer to the third 
5 ENT 14 
