Zool. Anz. xix. 1896, p. 449. See also note, antea, p. [70].

[42]

Monographie des guêpes sociales, Geneva, 1853-1858, pp. cc. and 356, plates i.-xxxvii.

[43]

Hence probably the great difference in the abundance of wasps in different years: if a period of cold weather occur during the early stages of formation of a wasp family, operations are suspended and growth delayed; or death may even put an end to the nascent colony.

[44]

CR. Ac. Paris, cxvii. 1893, p. 584; op. cit. cxxi. 1895, p. 731; Arch. Zool. exper. (3) iv. 1896, pp. 1-100.

[45]

Kumagusu Minakata, in Nature, l. 1894, p. 30.

[46]