Note 16 — THE SWALLOWS.

Hirundo erythrogastra.

[17] Petrochelidon lunifrons.

[18] Progne subis.

[19] Iridoprocne bicolor.

[20] Tachycineta thalassina.

[21] Stelgidopteryx serripennis.

[22] Riparia riparia.