6 BULLETIN" 1051, U. S. DEPARTMENT OF AGRICULTURE. 
the chests January 21, 1921. The adults were placed in a large vial 
with cloth and immediately replaced in Chest No. 1. Examination 
May 11 proved that about 200 eggs had been deposited and practically 
all eggs had hatched. 
(2) Four adults (sex undetermined) found in chests April 8, 1921, 
developed from larvae introduced into the chests January 1, 1921, 
were placed with cloth in the chests. Examination April 30 de- 
termined that 43 eggs had been deposited and all of them had hatched. 
(3) On February 12, 1921, 24, 30, 22, and 14 eggs, deposited, re- 
spectively, on February 9-12, 10-12, 11-12, and 12, were placed in 
Chest 2. Examination on March 2 determined all eggs to have 
hatched. 
(4) On March 10, 1921, 54, 106, 52, 25, and 45 eggs, deposited, re- 
spectively, on March 3-5, 5-7, 7-8, 8-9, and 9-10, were placed in 
Chest 2. Examination on March 17 determined that all eggs had 
hatched except 46, and of these, 40 were those deposited on' March 
9-10. Of 292 eggs deposited March 12-14 and held as checks in the 
laboratory outside of chests, 148 hatched on March 21-22 and 144 on 
March 22-23. A second examination on March 30 determined all 
eggs hatched. Of 32 eggs deposited March 2-3 and held as checks in 
laboratory outside chests, 20 hatched on March 14 (no further obser- 
vation made). 
(5) On April 27, 1921, 232 and 102 eggs deposited April 24-27 
and April 26-27, respectively, were placed in Chest 1. Examination 
on May 11 determined that all eggs had hatched. Of 284 eggs de- 
posited on April 24r-27 and held in the laboratory outside of the 
chests, 100 hatched April 30 and 184 between April 30 and May 3. 
(6) On May 14, 1921, 160, 53, 75, 69, 38, and 94 eggs deposited on 
May 7-9, 9-10, 10-11, 11-12, 12-13, and 13-14, were placed in 
Chest 3. Examination on May 19 determined that eggs deposited 
on May 7-11 had hatched; those deposited on May 10-11 were just 
hatching and the larvae had not yet had an opportunity to feed. The 
69, 38, and 94 eggs deposited between May 11 and 14 were not hatched 
but were found hatched when examined May 31. Of 336 eggs de- 
posited May 5-6, 1921, and held as checks in the laboratorv outside 
of chests, 111 hatched May 13, 146 on May 14, and 79 on May 18. 
(7) On June 6, 1921, 28, 51, 32, 12, and 91 eggs deposited, re- 
spectively, on June 1-2, 2-3, 3-4, 4-5, and 5-6, were placed in Chest 
No. 1. Examination on July 7 determined that all eggs had hatched. 
(8) On Mav 14, 1921, 138, 60, 61, 43, 36, and 19 deposited, re- 
spectively, on "May 7-9, 9-10, 10-11, 11-12, 12-13, and 13-14, were 
introduced in Chest No. 1. The eggs were examined on May 17, those 
deposited on May 7-9 and 9-10 were still hatching, while those 
deposited between May 11 and 14 were unhatched. Examination made 
on May 19 determined that all eggs had hatched which were deposited 
between May 7 and 11 and hatching had begun among those deposited 
May 11-12. No hatching was noted among eggs deposited May 12- 
14. Examination on May 31 showed that all eggs had hatched. Of 
151 eggs deposited May 16-17 and held as checks in the laboratory 
outside of chests, 13 hatched on May 24 and 138 on May 25. 
(9) On May 7, 1921, 36, 38, and 39 eggs deposited, respectively, on 
May 4-5, 5-6, and 6-7, were introduced into Chest No. 4. Examina- 
tion on May 12 determined that eggs deposited on May 4-5 had 
already hatched, but the larvae had not yet fed; eggs deposited on 
