Spent the day atlasing for the fourth year of the Massachusetts Breeding Bird Atlas. Covered a couple of blocks in Central Quabbin. Started the morning off with a singing Black Throated Blue Warbler which is on the early side. Also good numbers of Yellow rumped, Pine and Palms. The Pines had several pairs together with at least one gathering nest material. Ended the day with a Black and White Warbler. Despite alot of effort I was unable to find a single waterthrush of either species despite some good habitat. All and all a nice day and added two new species for the season.