89 
These insects usually select the center of the underside of the leaf as 
the point for locating colonies, which usually consist of but, compara¬ 
tively, few individuals. Dr. Fitch thinks this species passes the win¬ 
ter in the perfect winged state, as well as in the egg state. 
Aphis circjezandis. Fitch. 
This is a species found on the leaves of Galium circaezans. Length 
about one-eight of an inch to the ends of the wings; head and thor¬ 
ax, black; wings pellucid. 
I know nothing further in reference to this species as I have not 
seen it. 
Fig. 14. 
FiaV 
I. Aphis maidi8— ringed insect. 
II. Head and antennae of Aphis mali. 
III. Aphis maidis— wingless female. 
IV. Portion of a corn root infested by A. maidis. 
V. Glyphina ulmicola. 
VI. Pemphigus populicaulis. 
VII. Should be omitted. 
VIII. Wings of Phylloxera. 
If 
It 
m 
it 
it 
Aphis maidis, Fitch. The Maize or Corn Aphis. 
it 
This species, which appears to be different from the one infesting 
the Maize or Indian corn in Europe, was formerly supposed to confine 
its attacks to the stem or peduncle which bears the ear, the most 
vital point, so far as yield is concerned, of the entire plant; but Mr. 
Walsh afterwards found Aphides infesting the roots, which having 
reared to the perfect or winged state he was satisfied belonged to this 
species. 
Fortunately I have had an opportunity during the past year of 
studying this species and of adding further evidence on this point and 
also some new facts in reference to its habits. 
I give first the characters as presented by Fitch and Walsh, and 
also a description from specimens I obtained during the summer from 
a different part of the plant. 
Dr. Fitch’s description of those he found infesting the ear-stalks is 
in substance as follows : 
