Petronia Kaup, Natur. Syst., p. 158 (1829). Type, Petronia petronia Linn.
The genus Petronia differs from Passer in having proportionately longer wings and a much stronger bill, but it retains the typical Sparrow patch of colour at the base of the primaries.
The sexes are alike, both having a bright patch of yellow on the throat.
Fringilla petronia Linn., Syst. Nat., 12th ed., p. 322 (1766). Type-locality: North Italy.
The typical form is a smaller, darker bird than that which is found within our limits.