276 Journal of Agricultural Research voi. vi. No. 7 



emerged, however, eggs might be laid within the exit holes. Paraffin 

 wax, varnish, or linseed oil effectively closes the pores of wood. Wood 

 that has been seasoned less than 8 to 10 months will not be attacked by 

 Lyctus beetles. In applying chemical preventives, only sapwood that 

 has been seasoned for 8 to 10 months and longer should be treated. 

 Judging from facts in the seasonal history of this species, preventives 

 should be applied before March i. 



LITERATURE CITED 

 (i) DuGi&s, E. 



1883. Metamorphoses du Lyctus planicollis Le Conte. In Ann. Soc. Ent. Belg., 

 t. 27, p. 54-58, I pi- 



(2) HaIvLEz, Paul. 



1886. Loi de Torientation de I'embryon chez les insectes. In Compt. Rend. 

 Acad. Sci. [Paris], t. 103, p. 606-608. 



(3) Hebger, Ernst. 



1853. Beitrage zur Naturgeschichte der Insecten. In Sitzber. K. Akad. Wiss. 

 [Vienna], Math. Naturw, KL, Bd. 11, Heft 5, p. 927-942, 6 pi. Also 

 reprinted. 



(4) Hopkins, A. D. 



1910. Insects injurious to forest products. U. S. Dept. Agr. Bur. Ent. Circ. 



128, 9 p. 



(5) Kraus, E. J., and Hopkins, A. D. 



1911 . A revision of the powder-post beetles of the family Lyctidae of the United 



States and Europe. Pt. III. U. S. Dept. Agr. Btir. Ent. Tech. Ser. 20, 

 p. 111-138. 



(6) Pierce, W. D., Cushman, R. A., and Hood, C. E. 



1912. The insect enemies of the cotton boll weevil. U. S. Dept. Agr. Bur. Ent. 



Bui. 100, 99 p., 3 pi., 26 fig. 



(7) Xambeu, V. 



1898. Mceurs et metamorphoses du Lyctus canaliculatus Fabricius. In Bui. 

 Soc. Sci. Nat. Quest France, t. 8, p. 69-72. 



