i. 289;

on the colour of the Axis deer, ii. 290; on sexual difference of colour in _Hylobates hoolock_, ii. 291; on the hog-deer, ii. 303; on the beard and whiskers in a monkey becoming white with age, ii. 319.

BOAR, wild, polygamous in India, i. 267; use of the tusks by the, ii. 256; fighting of, ii. 263.

BOITARD and Corbie, MM., on the transmission of sexual peculiarities in pigeons, i. 283; on the antipathy shown by some female pigeons to certain males, ii. 118.

BOLD, Mr., on the singing of a sterile hybrid canary, ii. 53.

BOMBET, on the variability of the standard of beauty in Europe, ii. 370.

_Bombus_, difference of the sexes in, i. 366.

BOMBYCIDAE, coloration of, i. 394; pairing of the, i. 401.

_Bombycilla carolinensis_, red appendages of, ii. 179.

_Bombyx cynthia_, i. 346; proportion of the sexes in, i. 309, 313; pairing of, i. 401.

_Bombyx mori_, difference of size of the male and female cocoons of,