Life histories of North American wagtails, shrikes, vireos, and their allies

This is the eighteenth in a series of bulletins of the United States National Museum on the life histories of North American birds, with previous numbers issued as follows: 107, 113, 121, 126, 130, 135, 142, 146, 162, 167, 170, 174, 176, 179, 191, 195, 196. This bulletin deals with the Order Passeriformes, specifically the Families of Prunellidae (Accentors) ; Motacillidae (Wagtails and Pipits) ; Bombycillidae (Waxwings) ; Ptilogonatidae (Silky flycatchers) ; Laniidae (Shrikes) ; Sturnidae (Starlings) ; Vireonidae (Vireos) of North America.