Hemiprocne is a single genus of the treeswift (or crested swift) family Hemiprocnidae.

1/ Grey-rumped treeswift (Yến mào, Hemiprocne longipennis)
2/ Crested treeswift (Hemiprocne coronata)

Hemiprocne: Greek hemi- half-, small, akin to; Latin progne: swallow.