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[82]. The ideal of what a short-billed tumbler pigeon’s head should be.

[83]. McCook, The Honey-Ant of the Garden of the Gods.

[84]. The American Naturalist, February, 1902.

[85]. Belt, The Naturalist in Nicaragua, pp. 28, 29.

[86]. Fabre, Insect Life, pp. 275-283.

[87]. Peckham, The Instincts and Habits of the Solitary Wasps.

[88]. Bingley, Animal Biography.

[89]. The real purple of the ancients was a rich red—crimson or vermilion.

[90]. Romanes, Animal Intelligence, pp. 361, 362.