xanthopygium, Dicæum, [629]
xanthorhynchus, Chalcococcyx, [376]
Cuculus, [376]
Xenotreron incognita, [37]
Xeocephus, [461]
cinnamomeus, [463]
cyanescens, [463]
rufus, [461], [734]
Y
Yungipicus, [392]
basilanicus, [396]
fulvifasciatus, [396]
leytensis, [396]
maculatus, [394], [732]
menagei, [395]
ramsayi, [397], [732]
siasiensis, [732]
validirostris, [393], [732]
Yunigipicus leytensis, [396]