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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.

Treeswifts or crested swifts are a family, the Hemiprocnidae, of aerial near passerine birds, closely related to the true swifts containing a single genus, Hemiprocne. 

The bird family is distributed from India and Southeast Asia through Indonesia to New Guinea and the Solomon Islands.