188 
females of the first generation. It appears from the second ex¬ 
periment that newly hatched chinch-bags and those of the first, 
second, and third molts, when confined without food in vials partly 
filled with perfectly dry and finely pulverized earth lived respec¬ 
tively one day or less, two days, and three days, while adults so 
situated lived six days. This indicates that earth in the above 
condition is hurtful to chinch-bugs in confinement, the young 
dying first, and the other stages successively in the order of their 
age. It is evident from experiment No. 3 that chinch bugs con¬ 
fined in a saturated atmosphere on damp earth will live for a 
considerable length of time without food, newly hatched bugs 
living nine days, as did also bugs of the first molt, those of the 
second molt eleven days, those of the third molt (pupae) twenty- 
two days, and adults forty days. Comparing Nos. 1, 2, and 3, it 
appears that chinch-bugs will live longer in confinement in a 
saturated atmosphere on damp earth than they will when the 
earth and air in the vial are perfectly dry, or when the vial con¬ 
tains no earth at all. 
The details of the experiments just referred to are subjoined. 
No. 1. August 3, eighteen 2-dram vials with corks were pro¬ 
vided and grouped in lots of three each. In the first lot three 
adult females were placed without food, one in each vial. Adult 
males were placed in the second lot; pupae in the third; bugs of 
the second molt in the fourth; those of the first molt in the fifth; 
and newly hatched bugs in the sixth. The bottles were then 
corked tight and observed daily. August 4 the bugs seemed to 
be in their usual condition, and no change was noted on the 5th 
or 6th. On the 7th one adult female in the first lot was seen to 
be weakening, but the other insects were in good condition. No 
change was noted on the 8ch, but on the 9th one male and two 
females were nearly dead, and on the 10th all the insects in the 
first two lots were dead, having lived but seven days. The other 
insects seemed at this time in fairly good condition, with the ex¬ 
ception of the pupae, which were sluggish. August 11 the pupae 
were all dead; one insect in the fourth lot had died while the 
other two had molted, being however rather sluggish; all had 
died in the fifth lo L , two of them after molting; and the newly 
hatched bugs were also dead. On the morning of the 12th the 
two remaining bugs in the fourth lot were found dead. 
No. 2. This experiment was begun August 4, and was con¬ 
ducted like No. 1 except that the vials were about one third filled 
with perfectly dry and finely pulverized earth, and that the in¬ 
sects were divided into five lots instead of six, male and female 
adults not being confined separately as before. Tne adults con¬ 
stituted lot one; the youngest, lot five; and the intervening stages, 
lots two, three, and four. August 5 all of lots four and five were 
dead and the third lot showed signs of weakness, but the other 
insects were in good condition. August 6 all of lot three were 
dead and the pupae (lof two) were feeble. The adults seemed in 
good condition at this time. August 7 all the pup* were deed 
