926] 
Death Feigning in Anax Junius and Aeschna 
9 
Duration of Successive Feints 
Individuals 
Trials 
A 
B 
C 
1 
2' min. 30 sec. 
7 min. 
12 in. 
2. 
1 “ 
6 “ 30 sec. 
11 “ 
3. 
30 “ 
A U 
± 
1 “ 
4. 
30 “ 
3 “ 
2 “ 30 sec. 
5. 
35 “ 
3 “ 
6. 
1 “ 
7. 
15 “ 
1. 
5 min. 30 sec. 
5 min. 30 sec. 
9 min. 30 sec. 
2. 
3 “ 
1 “ 30 “ 
4 “ 
3. 
1 “ 30 “ 
3 “ 
13 “ 
4. 
30 “ 
1 “ 
4 “ 
5. 
45 “ 
4 “ 
6. 
5 “ 
2 “ 
7. 
3 “ 
1 “ 
8. 
2 “ 
9. 
2 “ 
10, 
1 “ 
1 . 
2 min. 
6 “ 
6 min. 30 sec. 
2. 
1 “ 
2 “ 
3 “ 
3. 
1 “ 
1 “ 
3 « 
4. 
30 sec. 
1 “ 
1 « 
5. 
45 “ 
45 sec. 
1 “ 
6 
45 “ 
30 “ 
7. 
15 “ 
1 “ 
8. 
45 “ 
9. 
45 “ 
10 
45 “ 
animal back into this condition, it was only necessary to gently 
stroke its sides. In experimenting, the larvae were placed on 
wet sand. One group of tests was made simply to determine 
the length of individual feints, and another set was made to 
discover the duration of successive feints. 
It thus appears that the duration of individual feints varies 
a great deal, and that the duration of feints in rapid succession 
tends to decrease. This is in accord with what is known of the 
phenomenon in other insects. 
I wish to take this opportunity of thanking Dr. W. S. 
Marshall of the Zoology department for his co-operation and 
suggestions in this and other experimental work. 
