#R, Zacatecas, Mexico; restricted to Valparaíso Mountains.
Until recently considered conspecific with A. ultramarina, but molecular evidence#R points to a split, and this is just supported by relatively understated phenotypic characters: differs in its paler blue upperparts, with blue on crown extending less far onto mantle (2); slightly less pronounced vague streaking on throat (1); rather smaller size (effect size for tail length in males −2.4, score 2); slightly shorter call in W taxa (arizonae, nominate; proposed W Mexican form gracilis subsumed into latter) (1) with slightly higher minimum frequency (1); and considerably shorter call in E taxa (couchii, potosina) (2) with notably lower minimum frequency (2)#R. Difference in call of E taxa, which are rather smaller and genetically fairly distinct, presumably reflects their unique possession of “rattle call”#R. Races represent three groups, otherwise differing mainly in depth of coloration and in size. Nominate wollweberi intergrades with arizonae to N. Four subspecies recognized.
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