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I• an effort to secure exact and detailed information in regard to the nidification of the Yellow-headed Blackbird (Xanthocephalus xanthocephalus), a nesting colony of these birds was subjected by the writer and an assistant to a continuous daily inspection for a period of thirty-two days, from May 13 to June 13 inclusive, 1901. The locality selected was a clump of quill-reeds (Phragmites phragmites) about an acre in extent, isolated by open marsh from a more extensive growth of reeds bordering a large slough which forms part of the preserve of the Long Meadow Gun Club, lying in 'the bottom-land of the Minnesota River and distant ten miles from the city of Minneapolis, Minnesota. It was on the opposite side of the slough from the buildings of the Gun Club, accessible only by boat and in no way subject to intrusion by domesticated animals of any sort. Observations were begun on May 13, and kom that date until June 13 the entire site was carefully examined once, and often twice, a day, with the exception of three days --May 16 and 28 and June 6•vhen severe wind and rain storms made it

ornithology

A Study of a Breeding Colony of Yellow-Headed Blackbirds; including an Account of the Destruction of the Entire Progeny of the Colony by Some Unknown Natural Agency