On the Senses, Instincts, and Intelligence of Animals, with special reference to Insects. Vol. LXV. International Scientific Series, 1888.
Bijd. Dierkunde, 16, 1888, p. 192.
For a review of their number see Wheeler, Psyche, vi. 1893, pp. 457, etc.
Ann. Soc. Ent. France, lxi. 1892, Bull. p. cclvi.
Mem. Ac. Belgique (2), xli. 1875, and Bull. Ac. Belgique (2), xliv. 1877, p. 710.