The genus Contopus is a group of small to medium-sized in the Tyrant Flycatcher family Tyrannidae.
These birds are commonly known as peewees, from the call of one of the more common members of this vocal group. They are generally grayish birds with wing bars that live in wooded areas.
The relevant species include:

Olive-sided Flycatcher, Contopus cooperi
Greater Pewee, Contopus pertinax
Dark Pewee, Contopus lugubris
Smoke-colored Pewee, Contopus fumigatus
Ochraceous Pewee, Contopus ochraceus
Western Wood-pewee, Contopus sordidulus
Eastern Wood-pewee, Contopus virens
Tropical Pewee, Contopus cinereus
Tumbes Pewee, Contopus (cinereus) punensis
Blackish Pewee, Contopus nigrescens
Cuban Pewee, Contopus caribaeus
Jamaican Pewee, Contopus pallidus
Hispaniolan Pewee, Contopus hispaniolensis
Lesser Antillean Pewee, Contopus latirostris
Puerto Rican Pewee, Contopus (latirostris) portoricensis
Saint Lucia Pewee, Contopus (latirostris) oberi
White-throated Pewee, Contopus albogularis