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 larvse 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 laboratory 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 Avhich 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 larvse had not yet fed; eggs deposited on 



