210 Illinois State Laboratory of Natural History. 



In an oats field (following corn) on the University farm 

 larval corn lice were found abundant May 4 on the roots of 

 Setaria in an ant's nest. 



In a field of corn on sod ground 1 noticed, May 31, that 

 the ants were very busy mining about the young corn plants 

 and evidently preparing for the reception of the winged 

 migrants. In two hills I found single specimens of the winged 

 corn root louse which had not yet begun to establish colonies. 

 I picked one of these up and put it down by another hill where 

 the ants were at work. Almost immediately a Lasius found it, 

 felt of it with the antennae, then grasped the base of the plant 

 louse's wings with its jaws and carried it below. 



I also found May 19 in a field northwest of Champaign 

 (corn following corn) many adult viviparous females with 

 young about them. The same day, on a neighboring farm, a 

 winged corn louse was found on one of the upper roots of a 

 corn plant (corn following sod). The ants had mined a consid- 

 erable opening along the side of the stalk through which the 

 louse must have entered. In the same field at the same time 

 two wingless viviparous females were found at some distance 

 from any corn field. 



In a field of fodder corn (on corn ground) on the Univer- 

 sity farm wingless adults of the second or possibly third gener- 

 ation were abundant May 25. A single winged specimen was 

 seen. 



Winged and wingless lice were common on roots of corn 

 in certain fields at Rankin, Vermilion county, July 1. 



In a field in Urbana wingless root lice were abundant in 

 hills of corn August 19, and infested hills were easily found. 



During October and the early part of November I found 

 the oviparous females repeatedly in various fields about Urbana. 



Breeding Cage Results. 



On April 25 a mass of aphid eggs found in a nest of 

 Lasius alienus hi a last year's corn field were transferred to a 

 breeding cage. The following day several lice had hatched. 

 One of these was isolated on a corn root, and moulted for the 



