80 
The Bulletin 
Table XI. 
MEASUREMENTS OF 20 PUP^I OF THE CORN BILL BUG. 
Number 
Total Length in mm. 
Width Across Mesothoracic 
Legs in mm. 
1 
13.87 
6.17 
2 
15.74 
6.43 
3 
12.26 
2.56 
4 
13.56 
6.13 
5 
14.39 
6.04 
6 
12.65 
5.47 
7 
11.39 
5.26 
8 
12.56 
6.17 
9 
12.56 
5.56 
10 
11.08 
5.08 
11 
13.39 
5.95 
12 
14.30 
6.13 
13 
13.56 
5.65 
14 
11.30 
5.30 
15 
12.95 
5.86 
16 
12.13 
5.13 
17 
13.48 
5.26 
18 
13.08 
6.08 
19 
12.95 
5.30 
20 
12.65 
5.65 
PUPAL CELLS 
In our work in the insectary and laboratory the larvie when they 
became full grown formed a compact oblong-ovoid cell in the stalk of 
corn, using partly masticated pieces of the cornstalk to plug the larval 
burrow and compacting the whole by interminable turnings and twist¬ 
ings as noted above (Tigs. 51, 52, 53, and 54). In these cells the pupa 
fit loosely. 
In the field some pupal cells are formed in the stalks of corn and 
some are formed in earthen cells in the soil just beneath the roots, 
usually about one inch deeper than the hole made when we pull a stalk 
up by the roots (Tigs. 56 and 57). These cells made in the soil are 
smooth and compact internally, but are unlined for the most part. 
Occasionally one finds a pupal cell where the tap-root has been entirely 
eaten away; then the pupal cell may be lined with fragments of the 
well masticated tap-root. But so far as our observations go, the larvae 
do not move material very far with which to make the lining of their 
pupal cells, but take whatever comes first to hand, be it either frag¬ 
ments of stalk or roots or particles of soil. 
EFFECTS OF MOISTURE UPON THE PI P E 
The pupae seem to be little affected by moisture. They can be 
drowned by complete immersion in water, but anything much short of 
complete immersion seems to have little effect upon them. Neither does 
