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Crested treeswift 
(Hemiprocne coronata)

The crested treeswift (Hemiprocne coronata) is a species of tree swift.

Hemiprocne: Greek hemi- half-, small, akin to; Latin progne: swallow.
coronatus, coronata: meaning "crowned".

Gray-rumped treeswift 
(Yến mào phao câu xám, Hemiprocne longipennis)

The grey-rumped treeswift (Hemiprocne longipennis) is a species of bird in the Hemiprocnidae family.
The bird is found in Brunei, Indonesia, Malaysia, Myanmar, the Philippines, Singapore, and Thailand.

Hemiprocne: Greek hemi- half-, small, akin to; Latin progne: swallow.
Longipennis is a New Latin adjective meaning "having long wings". 
The term comes from the Latin words longus (long) and pennis (wings). 

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.