- Polioptila nigriceps
- Blue-grey upperparts
- White underparts
- Long slender bill
- Tail: long and black apart from white outer tailbands on the uppertail
- The white undertail shows black only along a thin vertical centre line and at the very tip
Males have a prominent black cap.
 Similar Species
This species is very similar to the California Gnatcatcher and the Black-tailed Gnatcatcher.
Pacific slope of Mexico from Sonora to Colima; rare but regular breeder in southeastern Arizona in the United States.
This is a polytypic species, consisting of 2 subspecies.
- Extreme southern Arizona to north-western Mexico (Sonora and Chihuahua))
- Arid western Mexico (northern Sinaloa to Durango, Jalisco and Colima)
The diet includes insects.
Four eggs are laid in a small cup nest. Nest building and care of the young is carried out by both parents.
- Clements, JF. 2009. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2009. Ithaca: Cornell Univ. Press. ISBN 978-0801445019.
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