411 REFERENCE · Wikibooks
Dichotomous Key/Hemiprocnidae
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Key to Hemiprocnidae
1: Two white stripes clearly present on each side of head, one going from bill to back of head and the other going from bill to neck or chest.
2: Two white stripes scarcely or not present on head.
1
Hemiprocne comata: red patch present near eyes.
Hemiprocne mystacea: red patch not present near eyes.
2
Hemiprocne coronata: Patch of reddish color present near eyes.
Hemiprocne longipennis: Patch of reddish color absent near eyes.