There are many, many species of birds referred to as "flycatchers." To answer your question more specifically, you would need to provide a description of the bird or the area of the world it inhabits...something to identify it by.
There are three families of birds referred to as Old World Flycatchers as well the family of Tyrant Flycatchers. Families of the Old World Flycatchers include Monarch flycatchers, Silky-flycatchers, and Fairy flycatchers.
The small black bird with a yellow belly is called a Yellow-bellied Flycatcher.
The small bird with a yellow belly and black head is called a Yellow-bellied Flycatcher.
Oklahoma
The peewee is a flycatcher, a small gray and white bird.
Flycatcher .
Euler's Flycatcher was created in 1868.
Willow Flycatcher was created in 1828.
Humblot's Flycatcher was created in 1885.
Cocos Flycatcher was created in 1895.
Pale Flycatcher was created in 1851.
Cinnamon Flycatcher was created in 1837.
Pygmy Flycatcher was created in 1854.