100 
Antenme seven-jointed, distinctly and unquestionably about half the 
length of the body; first joint very large and about twice the length 
of the second; third longest, but not as long as the following two 
taken together; fourth, fifth and sixth nearly equal in length; the sixth 
perhaps a little the shortest; seventh distinctly longer than the sixth 
but shorter than the third, being about or very little more than half 
the length of the latter. Honey-tubes rather short, cylindrical, reach¬ 
ing less than half the distance to the tip of the tail; tail quite short, 
conical and hairy; beak reaching to the third pair of legs; legs hairy. 
Form of the body elongate-oval, very convex. Length about .07 inch. 
With these were found others which correspond almost exactly with 
that described as Tychea e?dgeronensis, found by Professor Burrill on 
the roots of Endive and Erigeron canadensis , as to color, number of 
joints in the antennae etc. That I now really believe, is but the larval 
form of this species, but have allowed the two to stand as distinct 
until the question as to identity, can be determined by further inves¬ 
tigation. 
That the species here described is a true Aphis can scarcely be 
doubted, as all the essential characteristics conform to that genus as 
restricted by Passerini. If this be so, then it is more than probable 
that this is but a dimorphic form assumed to adapt it to its suber- 
ranean mode of life and thus enable it to pass the winter. What it 
is in the winged state is as yet wholly a matter of conjecture, but 
that it is an A}Aiis inhabiting some composite plant is very probable. 
I am trying to rear it and if successful may be able to determine the 
question. 
Aphis carduella. Walsh. 
“'Tips of young thistle-shoots. Blackish. Antennae with joint six 
short, somewhat obtrigonate; joint seven as long as five and six put 
together. Honey-tubes as long as the tarsi. . Legs rather short, pale 
greenish; knees, tips of tibiae and tarsi dusky. Wings hyaline, with 
the tips of the front wings slightly furnose^, veins brown, yellowish 
on the costa, the third discoidal hyaline at its origin; stigma pale, 
dusky brown. Length to tip of the wings 0.9—.10 inch.” 
“On Cirsium altissimum , and an undetermined species same genus. 
Antennae attain the origin of the second discoidal vein when the wings 
are expanded, and the stigma is rather more than twice as long as 
wide and hunched on the exterior margin.” (Walsh). 
Aphis sambhci. Linn. The Elder Aphis. 
Syn. A. sambucifolicB? Fitch. 
t 
I think it more than probable that Dr. Fitch’s species is identical 
with or but a variety of Linnaeus’s species, and therefore give them 
as one here. The European insect is nearly black, a tinge of dark 
