16 



BULLETIN 847, U. S. DEPARTMENT OF AGRICULTURE. 



until perhaps as late as the last of August. These statements indi- 

 cate that in the Ozarks beetles continue to issue from the wood 

 over a period of approximately 100 days. Chittenden (7) states 

 that oviposition has been observed from June to September in a single 

 locality (Lawrence, Kans.) and says that at Albany, N. Y., beetles 

 have been observed in the trees as early as April. Felt and Joutel 

 (6) cite statements of observers giving the months of May, June, 

 July, and August as the time when beetles are abroad. 



All the rearings of the present writer indicate that the beetles issue 

 from the wood oyer a much shorter period than has been found by 

 the writers referred to above. The longest periods covered by the 

 emergence of the beetles were at French Creek, TV. Va., where, in 

 1916, 241 beetles issued from May 20 to June 18, a period of 30 days, 

 and in 1917, when 118 beetles issued from May 25 to June 23, a period 

 of 30 days. No beetles in either year issued before the first dates 

 or after the last dates named. In all the rearings of which the dates 

 of issue were kept, including 772 beetles, the first to issue was at 

 Demorest, Ga., on May 8, and the last at Munising, Mich., on July 

 23, the interval between these two extreme dates being 78 days. 



Table VI presents the data which have been accumulated rela- 

 tive to the time of emergence of beetles in several localities. 



Table VI. — Periods during which beetles of the roundheaded apple-tree borer 

 issued from the wood in different localities. 



Year. 



1911. 

 1912. 

 1913. 

 1914. 

 1915. 

 1916. 

 1917. 

 1918. 

 '914. 

 1914. 



1914. 

 1914. 

 1914. 

 1914. 

 1915. 

 1915. 

 1916. 

 1917. 



Locality. 



French Creek. W.Va, 



do 



....do 



....do 



do 



....do 



....do 



....do 



Weston, W.Va 



Great Caeapon, W. 

 Va. 



Elkins,W. Va 



Pickens, W. Va 



Pemberton, N. J 



Winthrop, Me 



Demorest, Ga 



Biltmore, N.C 



Winthrop, Me 



Munising, Mich 



Total number beetles . . 



Num- 

 ber 

 of 



bee- 

 tles. 



11 



27 



95 



116 



5 



244 



118 



21 



35 



13 



16 

 24 

 1 

 28 

 6 

 2 



First and last 

 emergence. 



May 23 

 May 14 

 May 12 

 May 22 

 May 25- 

 May 20 

 May 25- 

 May 18- 

 May 20 

 May 20 



-June 1 . . 

 ■June 6.. 

 June 6.. 

 ■June 8. 

 June 14. 

 June 18. 

 June 23. 

 May 28. 

 June 2.. 

 June 6.. 



772 



May 28-Juneo... 

 May 28- June 9... 



June 21.... 



Junel8-June30. 

 May 8-May 14... 

 Mayl5-May20.. 

 June20-July3... 

 July 23-July 25. . 



Num 



ber 



of 



days. 



Periods over which beetles issued from wood. 



LENGTH OF LIFE OF INDIVIDUAL BEETLES. 



Eight female beetles whose emergence and death were noted in 

 1911 and 1912 lived, respectively, 27, 31, 37, 41, 41, 44, 46, and 46 



