48 
nhlP to discover it. Repeated and thorough search made m Novem¬ 
ber in corn fields previously infested by both the root and aerial 
forms as well as in fields of sorghum and broom corn, yielded not 
a single specimen. A few winged root-lice were obtained on the 7th 
o£ j U ne upon the roots of corn, and, again, upon the ,9tli of July, 
but none others were seen during the season. 
T hfi vp not seen the corn-louse upon the foliage until after the mid- 
n 1 nf Tn W but it may be found then and thereafter either upon sorghum, 
brol co Y rn oV So, 6 unSl October, infesting at first the upper 
leaves of these plants, afterwards collected upon the tassels of the 
leaves ot t ie P - d benea th the husks at the 
vT’nf eab During al these months, wingless and winged 
L“3* !»»«■' together; tat I « not yet .bl, 
clearly to differentiate the successive generations. 
The appended table will serve to summarize the data given. 
CALENDAR OF CORN APHIS. 
1 O 
<<1 
Root Form. 
13 
IQ 
cd 
tn 
cc 
Aerial Form. 
a 
IQ 
CD 
& 
IQ 
CD 
03 
CP 
Sj 
S3 
*d 
P 
P 
IQ 
CD 
P- 
Remarks. 
May. 
June 
July 
« i 
< t 
August. 
‘ ( 
% • 
Sept.... 
22 
1 
6 
Corn 
7 
13 
29 
30 
3 
25 
27 
29 
31 
11 
20 
28 
Corn 
Sorghum 
Corn. 
Sorghum. 
Oct. 
6 
25 
2 
Corn 
Corn .... 
Sorghum. 
Sorghum.. 
Corn, broom 
corn and 
sorghum ... 
Sorghum. 
Corn. 
Panicum. 
Corn 
Corn 
Sorghum and 
cbm. 
Sorghum. 
Sorghum- 
Sorghum. 
Corn. 
Panicum.. 
Corn husks. 
Sorghum... 
Sorghum. 
Corn. 
Panicum. 
Sorghum. 
On upper leaves. 
Reared in labor'tory 
Tops of sorghurr 
and beneath huskt 
of corn. 
Tops of sorg’um anc 
bases of leaves. 
Wherever the species occurs either m the root or aerial foim 
great numbers of the common yellow ant, Lasms Jiavus , may like 
wise be seen in close attendance upon it. Early m spring tb 
ant sinks its burrows beside the hills of corn, and when disturbe. 
may often be seen to grasp the root-lice m its mandibles and tinn 
them away to a place of safety. Later, it attends _ in a si 
manner the aerial lice upon the leaves, sharing their care m tin 
stage with another species. 
It remains faithful throughout the summer, to such root-lice a 
still occur in the ground; and it is a very unusual occurrence ,o un 
