Velvet Ant (Dasymutilla aureola), Henry Coe SP, Santa Clara Co., CA - May 2009. Thanks to Kevin Williams from Bug Guide for species ID.
I was told it's common name is Velvet Ant.
Specimen in collection
Pinned specimen of Myrmilloides sp., a new county record
Pinned specimen collected from Dr. Laurie Vitt and Dr. Jan Caldwell's home property in LeFlore Co., Oklahoma
Mutillidae are a family of wasps whose wingless females resemble ants. Their common name velvet ant refers to their dense hair which may be red, black, white, silver, or gold. They are known for their extremely painful sting, facetiously said to be strong enough to kill a cow, hence the common name cow killer or cow ant is applied to some species.