u 
U 
u 
ti 
100 
Sept. 25, on roots of Panicum crus-galli ; Lasius. 
Oct. 15, timothy roots; oviparous female. 
20, corn roots. 
28, timothy roots; male and viviparous female. 
29, in meadow; Lasius niger; oviparous female. 
Nov. 19, blue-grass and timothy in corn field; oviparous and 
viviparous females and young. 
24, corn field; burrows of Lasius. 
24, about roots of corn; oviparous female. 
We see from the above list that this species has been found 
on the roots of the following plants: 
Corn (seventeen times), Apr. 6, May 19, 21 (three times), 24, 
28, 29, 31, June 1 (twice), 6, 13, July 15, 28, Oct. 20, Nov. 
24. Also in corn hill of previous year (twice), Mar. 21 and 23. 
Oats, May 9. 
Timothy (five times), Jan. 20, May 8, Oct. 15, 28, Nov. 19. 
Blue-grass (three times), Apr. 26, May 31, Nov. 19. 
Panic-grass ( Panicum crus-galli ), Sept. 25. 
Grass (five times). Feb. 13, Apr. 1, 19, May 7, 25. 
‘‘Sod” (six times), Mar. 9, 26, 29, May 19, 31, Oct. 29. 
Clover (three times), July 14, and Aug. 11 (twice). 
Shepherd’s purse (twice), Apr. 4 and 10. 
A dicotyledonous weed, Apr. 1. 
Thus it is shown that of the forty-seven sets of specimens of 
this species in the collections of the State Laboratory of Natural 
History eighteen were taken from the roots of cultivated plants, 
twenty-one from roots of grasses, three from clover, three from 
weeds, and two or three from ants’ burrows but not on plants. 
The fact that it has been found on corn much oftener than 
on other plants does not necessarily mean that it affects this 
plant to a greater extent than others, as in our investigations 
corn has been examined more frequently than the others men¬ 
tioned. 
It must be noted that this species has been seen but once in 
a field that was not in grass the previous year; viz., May 9, on 
roots of oats in old corn ground. 
It often occurs in the formicaries of ants with other species of 
root lice, mealy bugs (Dactylopius), and coccinellid larvae. Col¬ 
lections were not always made of the ants in attendance, but a 
careful study of the eighteen lots of ants taken in company 
with this root louse shows that Lasius niger has been so taken 
fifteen times, and the following species once each: Lasius mixtus, 
Formica iusca ga gates, and Solenopsis debilis. During the 
winter and early spring these lice have been found wandering in 
the burrows of Lasius niger , still guarded and cared for by the 
ants. 
