[511]

Cornell Univ. Agric. exp. station Bulletin, 44, 1892, and Bull. 108, 1896.

[512]

Zeitschr. wiss. Zool. xlii. 1885, pp. 569-638.

[513]

Zeitschr. Naturw. (2) xii. 1875, p. 438.

[514]

Réaumur, Mém. iii. 1737, Dixiéme Mémoire.

[515]

P. ent. soc. Washington, iv. 1897, p. 66.