Belding's Sparrow © fineartamerica.com

Genus sometimes subsumed in Ammodramus. Traditionally treated as conspecific with Savannah Sparrow (Passerculus sandwichensis) and Large-billed Sparrow (Passerculus rostratus), and often also with San Benito Sparrow (Passerculus sanctorum), but all differ in morphology and plumage and, to some extent, in ecology and separation at species level supported by recent molecular-genetic findings.

Two additional proposed subspecies from Baja California: annulus, described from Scammon's Lagoon (Guerrero Negro), is treated as a synonym of beldingi, and magdalenae, from North Estero (in Bahí­a Magdalenae), is synonymized with nominate.

Considered by some authors to be a subspecies of Savannah Sparrow (Passerculus sandwichensis).

The following 2 subspecies are recognised:

• beldingi Ridgway, 1885   -  Breeds extreme south-western USA (coastal southern California southern from Santa Barbara, possibly from San Luis Obispo County) southern in north-western Mexico (Baja California), including Todos Santos I, to Laguna de Ojo Liebre. Considered by some authors to be a subspecies of Savannah Sparrow (Passerculus sandwichensis).
• guttatus Lawrence, 1867   -  Breeds in southern Baja California from Laguna San Ignacio south to Bahí­a Magdalena. Non-breeding south to Cabo San Lucas. Considered by some authors to be a subspecies of Savannah Sparrow (Passerculus sandwichensis).

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