[121] Peal, Nature, Vol. XXI.
[122] Romanes, Animal Intelligence, p. 485 et seq.
[123] Lindsay, Mind in the Lower Animals, Vol. I. p. 410.
[124] Wallace, Malayan Archipelago, p. 41.
[125] Lindsay, loc. cit. ante, p. 413.
[126] Belt, Naturalist in Nicaragua, p. 119.
[127] Büchner, Geistesleben der Thiere, p. 318.
[128] Kirby and Spence, Entomology, p. 591.