378 
Journal of Agricultural Research 
Vol. XXI, No. 6 
Many experiments were carried on to determine whether this para¬ 
site would reproduce in mature eggs. No reproduction was secured in 
any of these experiments. 
The extreme variation in the duration of the life cycle, as shown in 
• Tables I and II, is important in that it would allow the parasite to sur¬ 
vive any unfavorable weather conditions for an extended period. 
Tabi,E II. —Duration of life cycle, proportion of sexes, and progeny of one female Anas- 
iatus semijlavidus 
Cage No. 
818 (i) 
818 (2) 
818 (3) 
818 (4) 
818 ( 5 ) 
818 (6) 
818 (7) 
818 (8) 
8x8 (9) 
Date egg 
Date adult 
Total 
Number 
parasite 
number 
and sex of 
was exposed. 
emerged. 
of days. 
adults. 
1914. 
X9IS- 
(July 24 
309 
Ic? 
Sept. 18 
Aug. x 
24 
3 i 6 
339 
id 
Id 
Dec. 7 
445 
id 
Sept. 22 
367 
2 9 
24 
369 
19 
20 
{ 27 
37 2 
19 
30 
375 
1 9 
1 
22 1 
t 
[Oct. 8 
383 
1 9 
[Sept. 22 
362 
id 
25 
l 24 
364 
Id,2 9 
[Dec. 9 
440 
id 
[Sept. 24 
362 
29 
27 
<Oct. 17 
38s 
1 9 
l 26 
394 
1 9 
Sept. 22 
358 
i<?, 1 9 
24 
360 
1 9 
29 
J 2 5 
361 
i<f, 1 ? 
26 
362 
19 
Oct. 10 
376 
id 
22 
388 
id 
(Sept. 30 
364 
it?, 1 9 
Oct. 8 
37 2 
19 
Oct. 1 
12 
376 
id 
I 21 
385 
2 d, 19 
INov. 7 
402 
id 
(May 17 
226 
id 
Sept. 3 
335 
19 
3 
22 
354 
39 
25 
357 
19 
[Nov. 7 
400 
id 
5 
(Sept. 28 
[Oct. 25 
358 
3 85 
1 9 
id 
Average number of days in life cycle=366.7. 
Maximum number of days in life cycle=» 445. 
Minimum number of days in life cycle= 226. 
Proportion of sexes= 20 males and 29 females. 
Total progeny of one female=6o individuals. 
Result of dissecting eggs 
still intact ou May 20, 
1916. 
Three dead larvae. 
No parasitism. 
One dead larva. 
One dead male. 
One dead female. 
One living larva. 
One dead larva. 
Four dead larvae. 
One dead pupa. 
Two dead females 
