Appeared to play dead & exuded an orange substance from leg joints when disturbed. The latter is the source of the the common name 'oil beetle.' The name 'blister beetle' apparently derives from the fact that this substance contains a chemical called cantharidin that is a skin irritant (fortunately it didn't appear to cause any reaction in the skin on my palms). More info here: http://www.journal-news.net/page/content.detail/id/586173/Blue-beetle-looks-like-ant.html?nav=5067
Beware confusion with Omophlus lepturoides or Lagria hirta (both look similar but have a black pronotum)
Blister beetles are beetles (Coleoptera) of the family Meloidae, so called for their defensive secretion of a blistering agent, cantharidin. There are approximately 7,500 known species worldwide. Many are conspicuous and some aposematically colored, announcing their toxicity to would-be predators.