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Extremely low mass (ELM) white dwarfs (WDs) with masses <0.25 Msun are rareobjects that result from compact binary evolution. Here, we present a targetedspectroscopic survey of ELM WD candidates selected by color. The survey is 71%complete and has uncovered 18 new ELM WDs. Of the 7 ELM WDs with follow-upobservations, 6 are short-period binaries and 4 have merger times less than 5Gyr. The most intriguing object, J1741+6526, likely has either a pulsarcompanion or a massive WD companion making the system a possible supernova TypeIa or .Ia progenitor. The overall ELM Survey has now identified 19 doubledegenerate binaries with <10 Gyr merger times. The significant absence of shortorbital period ELM WDs at cool temperatures suggests that common envelopeevolution creates ELM WDs directly in short period systems. At least one-thirdof the merging systems are halo objects, thus ELM WD binaries continue to formand merge in both the disk and the halo.

The ELM Survey. III. A Successful Targeted Survey for Extremely Low Mass White Dwarfs