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Comparative Numbers of Chinch Bugs Hibernating in Tifferent Grasses 
The work of obtaining information on hibernation in different grasses 
was greatly facilitated by Philip Luginbill's knowledge of the speciis of 
grasses encountered. We were very fortunate in having his assistance with * 
field work and identification of grasses. In determining the comparative 
dance of bugs in different kinds of grasses Andropogon furcatus (big bluester.) 
was used as the standard, this grass being rated at 100. Thp rating cf each 
grass was determined by comparing the average infestation in all the samples 
cf that grass taken from the various areas with the average infestation in all 
the samples of A. furcatus from the same areas. For instance, the average 
infestation in the 6 samples of T. flavus was 152, and the average infestat : --. 
in the 23 samples of A. furcatus from the same areas was lUl. The rating of 
T. flavus was therefore lUl: 152: : 100:x , or 10?. Certain grasses were more 
prevalent than others in different areas and it would have been obviously in- 
correct to make comparisons of the infestation in a species of grass in one 
locality with the infestation in another species under the different ecological 
and infestation conditions prevailing in another locality. All samples were 
taken from the most favorable exposures available. The woodland samples were 
all 1 square foot and were taken at or close to south edges of such areas. 
Some of the species represented by only one or a few samples may be far out 
of place, otherwise the rating below is thought to be fairly accurate for this 
year and region. 
Hibernating media. 
Rating 
1/ 
Samples 
Average bugs 
per 1/ ^ sq. ft. 
Andropogon scoparius (little bluestem) 
Tridens flavus (tall redtop) 
Andropogon furcatus (big bluestem) 
Sporobolus asper (long-leaved rush-grass) 
Atheropogon curtipendulus (tall grama-grass) 
Hystrix hystrix (bottle-brush grass) 
Elymus canadensis (nodding wild rye) 
Elymus virginicus var. submuticus 
Elymus virginicus (Virginia wild rye) 
Sorghastrum nutans (Indian grass) 
Dactylis glomerata (orchard-grass) 
Phleum pratense (timothy) 
Br emus inermis (awnless brome-grass) 
Elymus striatus (slender wild rye) 
Elymus stria. tus var. arkansanus 
?c.nicum virgatum (switch-grass) 
cedges (clump type) 
Spartina michauxiana (tall marsh-grass) 
Sedges (sparse or running type) 
Elymus virginicus var. jejunus (western wild rye) 
Woodland leaves and grass 
•r.gropyron repens (quack- grass) 
?oa pratensis (Kentucky blue-grass 
Woodland leaves 
Volunteer wheat 
Number 
223 
108 
100 
93 
78 
7U 
58 
58 
50 
50 
U6 
^3 
Ui 
37 
36 
22 
9 
9 
8 
5 
c 
J 
3 
2 
2 
10 
6 
108 
18 
2 
1 
33 
1 
9 
7 
3 
57 
1 
3U 
2 
15 
25 
1 
13 
10 
10 
1 
9 
10 
19 
Number 
152 
198 
127 
58 
87 
118 
69 
1U6 
56 
119 
86 
30 
U7 
Uo 
62 
16 
11 
9 
7 
10 
2 
U 
5 
2 
A. furcatus equals 100. 
