Original wrappers in very good condition, wrappers chipped. Memoirs of the Museum of Comparative Zoology, Volume XL, No. 2, pp. 57-78, 1911. One color plate. Together with a second paper by Faxon, Brewster's Warbler (Helminthophila lecucobronchialis): A Hybrid between the Golden-winged Warbler (Helminthophila chrysoptera) and the Blue-winged Warbler (Helminthophila pinus). Memoirs of the MCZ, Vol XL, No 6, pp. 311-316, 1913. Previous owner's name on front wrapper of both numbers.