80 
IOWA ACADEMY OF SCIENCES. 
apterous specimens found on Dogwood at the same time, and 
having five instead of six jointed antennae. Plants of Shep- 
herd’s Purse containing the root lice and their attendants were 
transplanted to the green-house. No winged forms were 
obtained from these, the plants maturing and dying. 
Winged specimens of root lice were found on roots of Foxtail 
{Setarla viridis) in field with ants June 24th. The venation of the 
wings showed them to be related to the Schizoneura, but they 
were not as large nor of the same color as the winged forms 
found on Dogwood. (Color dirty white, antennae, head, thorax 
and wing callosities slightly dusky, seventh and eighth abdom- 
inal segments each with a dusky band, sometimes with pulver- 
ulent area on abdomen. Joints III, IV, V and VI, each with 
one sensorium.) Furthermore, all winged forms had disap- 
peared from Dogwood before June 15th. A few days later, 
June 28th, a plant of Foxtail was found containing pupee and 
wingless root lice ; this, with the colony of ants, was trans- 
planted to root cage and kept in laboratory. July 3d winged 
individuals were obtained from root cage identical with winged 
forms found out doors on Foxtail June 24th. Winged speci- 
mens; taken in colonies on roots of Pigeon grsiss (Setaria glauca, 
Beauv.) at the same time, were apparently identical with those 
of the Foxtail. These latter were depositing their larvae on the 
grass roots without apparent attempts to migrate. 
The latter part of August, as the annual grasses commenced 
to die from the effects of dry weather, lantern globes, also tents 
made of bunting, were placed over the same species of grass as 
in the preceding fall. On August 30th ants were observed, appa- 
rently removing wingless root lice from one of the traps. This 
they accomplished by mining under the lantern globe. This 
fact may account for the failure to obtain winged forms from 
covered grass roots the previous fall. Examination of the 
roots of grasses earlier in the fall showed that the Setarias were 
most infested. Later in the season, when these grasses com- 
menced to die, the lice were found more abundant on the Panic 
grasses. 
Winged specimens of Schizoneura corni, Fabr., were found 
returning to Dogwood [Cornus asperfoUa, Michx.), September 
8th. As we had been watching annual grasses, it seemed more 
than evident that they could not have migrated from those, for 
no winged forms had been found on the roots since July 3d. 
