Posted to verify genus & species.
Posted to extend BugGuide map range for genus & sp. into NV.

Could not be keyed out in "Discover Life" Lady Bug key, although I can find an example there with information.
Easily keyed by color patterns in the iOS Adalia app by James Bailey.
Characters below are from Arnett Beetles Vol 2 (1).

Characters pictured.
Head---------
-- Color entirely black except antenna and mouth parts yellowish brown (from BG info).
-- Eye with canthus cutting a notch in eye and expanded to cover basal antennomeres.
-- Mandible scythe-like with single apical tooth (seen in several pics).
Pronotum------
-- Pronotum not margined at base.
-- Tarsal claw with basal tooth.
-- Pronotum and elytra discontinuous (from BG info).
Abdomen-------
-- Postcoxal line incomplete and recurved apically.