Zosterops whiteheadi vulcani Hartert, Bull. Brit. Orn. Club
(1903), 14, 14.
Zosterops vulcani McGregor and Worcester, Hand-List (1906), 95;
Grant, Ibis (1906), 473.
Mindanao (Goodfellow, Mearns).
Diagnosis.--"Entirely like Z. w. whiteheadi but larger and with a dusky
shade under the eye. Wing, 58.8; tail, 40; bill, 10.5." (Hartert.)
A male from Mount Apo measures: Wing, 55; tail, 38; culmen from base,
12.5; bill from nostril, 8; tarsus, 18. A female, wing, 54; tail,
37.5; culmen from base, 12.5; bill from nostril, 7.5.
This subspecies appears to be very slightly different from Zosterops
meyeni.