Hypochera ultramarina, [577]

Hypocleidium, [21]

Hypocnemis, [488]

Hypocolius ampelinus, [527], [527]

Hypolais, [514], [517], [518]

Hypopyrrhus, [580]

Hyporhachis, or aftershaft of feather, [3]

Hypositta, [537]

Hypotaenidia, [246] f.;

H. brachypus, [247];