Hymenoptera, large size of the cerebral ganglia in; classification of; sexual differences in the wings of; aculeate, relative size of the sexes of.
Hymenopteron, parasitic, with a sedentary male.
Hyomoschus aquaticus.
Hyperythra, proportion of the sexes in.
Hypogymna dispar, sexual difference of colour in.
Hypopyra, coloration of.
Ibex, male, falling on his horns; beard of the.
Ibis, white, change of colour of naked skin in, during the breeding season; scarlet, young of the.
Ibis tantalus, age of mature plumage in; breeding in immature plumage.
Ibises, decomposed feathers in; white; and black.