A number of subspecies are recognized within its widespread range in South Asia and Southeast Asia. The nominate race is from the lowlands of Sri Lanka. Race "O. s. fernandonis" is found in the highlands of Sri Lanka. Neighbouring India has "O.s. guzuratus" in the peninsula and west to Pakistan while towards the north "O. s. patia" is found in the Terai of Nepal along the Himalayan foothills until Myanmar. A small population of "O. s. patia" is also found in the northern Eastern Ghats (Wangasara). The hills of northeastern India have "O. s. luteus". In Southeast Asia "O. s. inexpectatus" and "O. s. maculicollis" are found in Thailand, Laos and Vietnam, Malaysia, Cambodia and Vietnam. South east China, including the island of Hainan, and Tonkin in Vietnam have "O. s. longicauda" while "O. s. edela" is found on Java.

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