76 
Dr- Fitch’s description of those he found infesting the ear stalks 
in substance as follows: . x , , . 
The larvae are either green or yellow; the latter being those whic 
ultimately acquire wings; before changing into pupse, they usual! 1 
acquire a"pale reddish color, and are dusted over with a white powde 
The wingless females are dull blackish, tinged with gieen ar. 
sprinkled with fine whitish powder; head and generally two bam 
on thorax, black; the abdomen is usually marked with black spo, 
along the sides ; honey-tubes rather short; antennas blank, and n 
more than half as long as the body. Winged females, similai, lengt 
of the body, six-hundredths of an inch; general color, black; the a 
domen dark greenish, with black dots along each side, and thn 
black bands at the tip. . , , 
Mr. Walsh describes those he found infesting tne roots as havn 
the general color, both of the pupa and perfect insect, pale green, t 
female pupa usually has three, short transverse dark lines on t 
thorax, and three similar ones on the abdomen. It is figured m tl 
fifth volume of the transactions of the Illinois State Agncultur 
Society, a copy of which is reproduced here. 
[ Fig. 18. ] 
Fig - 1 
Fxg. IT. 
Fig. a 
Fig.VT 
Fig.YU 
FigFM 
I. Aphis maidis— winged insect. 
II. Head and antennae of Aphis mall. 
III. Aphis maidis— wingless female. 
TV. Portion oi corn-root infested by A. mantis. 
V. Colopha ulmicola— showing veins of wings and antennae. 
VI. Pemphigus populicaulis— showing veins of wings and antennce. 
VII. (Should he omitted.) 
VIII. Wings of Phylloxera. 
The antennae are unusually short for this genus, scarcely reach* 
to the tip of the thorax, but nevertheless it appears to be a true Apq 
the honey-tubes are also rather short; the first discoidal vein is tar 
er from the second than the second is from the third, and the stigi 
is prominent and pointed at each end. He states that the puJW 
dusted over with a whitish bloom like that of a plum, and v ith q 
In the latter part of July I found an Aphis feeding on the tab. 
of corn, which, unon examination, I found to belong to this spec 
late in the season other specimens were sent me in alcohol which J| 
