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Key to the Species.
a. Base of tail white. a.' White on tail extending nearly to tips of feathers C. cyaneus, p. 13. b'. White on tail confined to base. a''. Upper plumage blue. a'''. Breast orange-chestnut. a4 . No white frontal band C. hodgsoni ♂, p. 14. b4. A white frontal band C. hyperythrus ♂, p. 15. b'''. Breast white, pale buff, or fulvous-grey, [p. 16. c4 . No white supercilium C. leucomelanurus ♂ , d4. A white supercilium C. superciliaris ♂ , p. 17. b''. Upper plumage black C. melanoleucus ♂ , p. 18. b. No white on tail. c'. Upper plumage blue. c''. Crown and rump cobalt-blue, back dull blue, c'''. Axillaries and under wing-coverts white C. sapphira ♂ , p. 20. d''. Axillaries and under wing-coverts chestnut C. oatesi ♂ , p. 20. d''. Crown, rump, and back of the same blue. e'''. Whole lower plumage white .... C. astigma ♂ , p. 19. f'''. Chin, throat, and breast dark blue ; abdomen white C. pallidipes ♂ , p. 22. g'''. Whole lower plumage pale blue . . C. unicolor ♂, p. 22. h'''. Breast ferruginous or chestnut. e4. Chin and throat blue C. rubeculoides ♂ , p. 23. f4. Throat ferruginous like breast. a5. First primary about half length of second ; wing under 3 . . C. tickelli, p. 25. b5. First primary much shorter than half second; wing over 3. C. magnirostris ♂ , p. 26. d'. Upper plumage brown or rufescent. e''. Breast chestnut or ferruginous. i''. First primary about half length of second ; sides of head grey .... C. pallidipes ♀ , p. 22. k'''. First primary much shorter than half second ; sides of head fulvous or rufous. g4 . Wing considerably under 3 .... C. rubecidoides ♀ , p. 23. h4 . Wing over 3 C. magnirostris ♀ , p. 26. f''. No chestnut on breast. l'''. Wing considerably over 3. l4 . First primary much shorter than half second ; yellowish - buff patch on throat C. oatesi ♀ , p. 20. k4 . First primary about equal to half second ; no patch on throat . . C. unicolor ♀ , p. 22. m'''. Wing considerably under 3. l4. Second primary equal to ninth ; wing 2-3 ; tail 1-6 C. hyperythrus ♀ , p. 15. m4 . Second primary shorter than the secondaries; wing 2 -4; tail 2,, C leucmmelanurus ♀, p. 16.
