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The DUSTiNGS survey (DUST in Nearby Galaxies with Spitzer) is a 3.6 and 4.5micron imaging survey of 50 nearby dwarf galaxies designed to identifydust-producing Asymptotic Giant Branch (AGB) stars and massive stars. Using twoepochs, spaced approximately six months apart, we identify a total of 526 dustyvariable AGB stars (sometimes called "extreme" or x-AGB stars; [3.6]-[4.5]>0.1mag). Of these, 111 are in galaxies with [Fe/H] < -1.5 and 12 are in galaxieswith [Fe/H] < -2.0, making them the most metal-poor dust-producing AGB starsknown. We compare these identifications to those in the literature and findthat most are newly discovered large-amplitude variables, with the exception ofapproximately 30 stars in NGC 185 and NGC 147, one star in IC 1613, and onestar in Phoenix. The chemical abundances of the x-AGB variables are unknown,but the low metallicities suggest that they are more likely to be carbon-richthan oxygen-rich and comparisons with existing optical and near-IR photometryconfirms that 70 of the x-AGB variables are confirmed or likely carbon stars.We see an increase in the pulsation amplitude with increased dust production,supporting previous studies suggesting that dust production and pulsation arelinked. We find no strong evidence linking dust production with metallicity,indicating that dust can form in very metal-poor environments.

An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS), II. Discovery of Metal-poor Dusty AGB Stars