Hand coloured lithograph (circa 1928) of (diaphoropterus leucopyga) which is now a synonym of the norfolk island long-tailed triller (lalage leucopyga leucopyga) from the birds of australia (1910-28) by gregory macalister mathews (1876-1949) - artwork by henrik gronvold (1858–1940) a danish bird illustrator. Date: between 1910 and 1928.
