Microvelia rasilis Drake was taken in Montezuma Well, Yavapai Co., Arizona, along with Microvelia hinei Drake and Hydrometra aemula Drake (Heteroptera: Hydrometridae). These are all new to this locality; however, the latter two species are previously known from Arizona.
Polhemus, John T. and Sanderson, Milton W.
"Microvelia rasilis Drake in Arizona: a species new to the United States (Heteroptera: Veliidae),"
Great Basin Naturalist: Vol. 47
, Article 27.
Available at: http://scholarsarchive.byu.edu/gbn/vol47/iss4/27