Javan Blue Flycatcher (Cyornis banyumas) [XC71628]
by Paulo Alves from , Indonesia (subsong)
Javan Blue Flycatcher (Cyornis banyumas) [XC284675]
by Swiss Winnasis from , Indonesia (song)
Subspecies
Cyornis banyumas (Sibley and Monroe 1990, 1993) has been split into Hill Blue-Flycatcher (Cyornis banyumas) and Large Blue-Flycatcher (Cyornis magnirostris) following Renner et al. (2009) who point out parapatric (and possibly sympatric) breeding between whitei of Hill Blue-Flycatcher (Cyornis banyumas) and Large Blue-Flycatcher (Cyornis magnirostris), strong migratory habit in magnirostris which is weak or absent in banyumas and a number of morphological differences between the two taxa.
Probably forms a superspecies with Palawan Blue-Flycatcher (Cyornis lemprieri), and has been considered conspecific; songs rather similar, and separation based mainly on plumage. Some evidence of hybridization with Tickell's Blue-Flycatcher (Cyornis tickelliae) in Malay Peninsula. Recently suggested that subspecies magnirostris merits treatment as a separate species on basis of bill size, colour of male upperparts and long primary projection.
The following 10 subspecies are recognised:
magnirostris Blyth, 1849 - Breeds eastern Himalayas (Arunachal Pradesh). Non-breeding central and southern Myanmar, southern Thailand and Peninsular Malaysia. Considered by some authors to be a distinct species, Large Blue-Flycatcher (Cyornis magnirostris).
whitei Harington, 1908 - Northern and eastern Myanmar, south-central China (southern Sichuan, north-western and south-western Yunnan, Guizhou), northern Thailand, northern and central Laos and northern Vietnam (western Tonkin, northern Annam).
lekhakuni (Deignan, 1956) - Hills of southern Thailand.
deignani Meyer de Schauensee, 1939 - South-eastern Thailand.
coerulifrons Stuart Baker, 1918 - Southern Thailand and northern and central Peninsular Malaysia.
ligus (Deignan, 1947) - Western Java.
banyumas (Horsfield, 1821) - Central and eastern Java.
coeruleatus (Büttikofer, 1900) - Borneo.
mardii (Hoogerwerf, 1962) - Panaitan I. (off western Java).