J. Bond and Meyer de Schauensee, 1939,
Yánac, Ancash, Peru.
Hitherto treated as conspecific with X. parina, although given species rank when first described, with good reason: differs in its (in male) bright blue shaft streaks (present but less obvious on race bella) vs none (1); (in female) mid-crown to nape ashy brown vs dull blue (3); blue vs ferruginous on malar area at base of lower mandible (ns); blue vs whitish subocular line (1); much larger size (five male wings comprising nominate 82.5, 79, 78 mm and bella 76.5, 75.5 vs two X. parina 66.5, 61.5#R; allow 3); moreover, commonest song type very different (lower speed and lower number of notes: 2+2=4)#R. Race bella marginally smaller and duller. Names petersi and bella described simultaneously, but latter as a race of former, so petersi claims priority. Two subspecies recognized (but see below).
Also, race uncertain, SC Ecuador (mainly in Cajas National Park#R); sightings and specimens originally believed probably referable to bella, but recent dissertation#R considers the population involved to be taxonomically distinct (and relatively distinctive, the birds being larger and notably heavy); name not yet validly introduced.
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