77 
; Adult wingless , Winged 
Date. Young. females. Pupe. | females. 
Sorghum and Pani-|/Sorghum and Pani- 
July 31 eum. cum. 
: Panicum in sor- Panicum in sor- 
Aug. 4) Panicum and corn. ehum field. ghum field. 
: Geiss and sor- 
Aug. 11 Grass. ghum. | 
Oct. 2 Sorghum, | 
Oct. 0 Grass. | 
Oct. 12 On sorghum roots. 
Corn in breeding 
Oct. 20 cage. 
Lasius burrows in 
Noy. 25 corn field. | 
From the above table we learn that th is grass root louse has been 
ee Be us on com ten times, as follows May 23, June 13 (twice), 
17, 28, 25, July 13,28, August 4, and Ockahet 20 (in breeding cage). 
Other Aes frame ae roots of which it has been taken are as follows: 
sorghum (five times) July 25, 31, August 11, and October 2 and 12; 
timothy (twice) June 30 and July 3; blue- grass (once) June 25; grass 
(seven times) May 24, 26, 28, June 10, 25, August 11, October 10; Pani- 
cum (five times) June § 23, 29, July 13, 31, and August 4; Setaria (seven 
times) May 16, June 1, 13, 16, 25, July 13 and 15; smartweed (Polyg- 
onum ) (once) June 26. 
Thus we see that it has occurred fifteen times on cultivated plants, 
twenty-two times on the grasses, and once on a dicotyledonous species. 
It will further be seen that it does not appear to show a decided prefer- 
ence for any single food plant at any certain time of the year. A general 
preference for grass roots is shown, however, by the fact that in several 
cases where the roots of corn and grass were closely intertwined, the 
Schizoneura was found upon the latter only. It occasionally occurs on 
the roots of grass in fields planted with wheat, oats, ete., and wherever 
it is found in cultivated fields it is usually much ‘the most abundant 
in those which were in sod the previous year. We have found it very 
common in the viviparous wingless form on the roots of various peren- 
nial grasses—blue-grass, timothy, and several native species—as the 
sod was broken up; and there is little doubt that plants of this-class 
furnish its principal sustenance. 
LIFE HISTORY. 
The life history of this species is still incomplete, all our observa- 
tions applying only to viviparous females, winged and wingless. Th 
