These are images of a male Wasp in the genus Eucerceris.
Full Size Image: Click Here
Geographic Distribution = about 5 species possible in this area (central Arizona)

Here is relevant info from the key, (1975) found on the info tab for the genus Eucerceris: (tickle hairs, color & wide triangle)
From document: Bohart, Grissell: California Wasps of the Subfamily Philanthinae (1975)
From page 27: "In males of Eucerceris, the development and distribution of apical hair brushes or fimbriae on the sterna offer convenient separational characters."
From page 29: "E. canaliculata is a yellow & red wasp which is recognized in the male by the presence of prominent fimbriae on sterna 111-V of which that on V is shortened, but stretches across the middle third of the sternum. Also, the ocellocular distance is unusually great. "
From page 32: "E. pimarum is the only extensively red species with weakly differentiated posteromedian hair tufts on sternum V in the male."

NOTES: The red arrow is pointing at his hairs or fimbriae, on the sternal S4 segment.