17. Alaudidæ: Larks.

Larger than an English sparrow; bill short, conical, frontal feathers extend along the side; wings pointed; claw on hind toe very long and nearly straight. (Ridgway.)

Food: insects. Sexes nearly alike. Found on ground in fields and roads.

18. Tyrannidæ: Flycatchers.

Mostly larger than an English sparrow; bill broad, flattened, curved downward at end, and notched at tip; bristles along the gape; wings and tail variable. (Ridgway.)

Entirely insectivorous. Found in woods and fields and about houses.

19. Trochilidæ: Hummingbirds.

Our smallest birds; bill slender, sharp, and straight, usually longer than head; wings long and pointed; legs short; feet small and weak; claws curved and sharp. (Ridgway.)

Food: tiny insects and the honey of flowers. Sexes unlike. Found about flowers.

20. Micropodidæ: Swifts.