108 
“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.” 
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 hiving 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 sub-costal veins of the front wings 
close together and parallel throughout; second discoidal vein decidedly 
sinuate and much nearer to the third than to the first; third obsolete 
at the immediate base, curving somewhat strongly outward as it ap¬ 
proaches the origin of the first fork; second fork rather nearer to the 
.apex of the wing than to the third vein but difference slight; fourth 
vein very sharply curved throughout so that its middle portion ap¬ 
proaches much nearer the first fork than its ends. Antennae longer 
than the body, slender; third joint longest; fourth a little shorter than 
the third; fifth a little shorter than the fourth; sixth about half the 
length of the fifth or less; seventh in the only complete an¬ 
tennae obtained, about as long as the fifth. On most of the specimens 
I was unable to observe any honey-tubes; but in one specimen found 
on the same leaves and which appears to belong to this species, these 
were apparent but very short, their length scarcely exceeding their 
diameter. This specimen was of the same delicate yellowish color, 
but the wings were perfectly pellucid. It is impossible to decide in 
reference to the honey-tubes from the mounted specimens which are 
imperfect. 
On one of these specimens I found a species - of mite fastened to 
the metathorax or base of the abdomen so as not to interfere with 
the flight of the Aphis. It is probably a species of Trombidium but 
as it is evidently in its larval state it is difficult to assign it to its 
proper position. It is probably the young of Dr. Packard’s T. bulbipes 
but it dirfers fiom that species in not having the tarsi enlarged; it 
also has the tarsi furnished with two strongly curved claws. 
It is possible that this is Dr. Fitch’s Lachuus quercifolice but it is 
impossible to identify the two from his very brief description. It 
approaches very nearly to Aphis quercus , Kalt, which Koch has placed 
in Callipterus , and I would have identified it with that species but 
for the clouded wings. It will fall in Myzocattis as I have given the 
characters of that genus, and is probably a variety of the species under 
which I place it. 
Myzocallis hypeici. New sp. 
Found on St. Johns wort, Carbondale, Illinois, in April. 
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