Specific epithet is the classification level that pensylvanica refer to.
Specific epithet is the second part of the scientific name of a particular species. The scientific name is the name assigned to an organism. The scientific name has two parts; the genus and the specific epithet. The genus name starts in capital letter while the specific epithet starts in small letter. For example, in Dendroica pensylvanica, the genus name is Dendroica and the specific epithet is pensylvanica.