Dichotomous Key/Hemiprocnidae

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.