Key to Subspecies.
A. Spots on "back large and lunate on lower
back; breast also marked with white E. m. maculatus, p. 57.
B. Spots on back smaller and round; breast
unspotted black E. m. guttatus, p. 58.
The Fauna Of British India, Including Ceylon And Burma-birds(second Edition)
Baker, EC S (1922–1930) The fauna of British India including Ceylon and Burma. Second edition. vol.2 1924.
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