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For Insects, Spiders & Their Kin
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Photo#1291978
Small Red Wasp - Tachypompilus ferrugineus

Small Red Wasp - Tachypompilus ferrugineus
Bullitt County, Kentucky, USA
September 13, 2016
Small red wasp nectaring on white wingstem. Half the size of many of the other wasps. Didn't stay around long either - only one shot...

Moved
Moved from ID Request.

My first thought was Tachypompilus ferrugineus


I don't think they'd generally be described as "small" though.

 
Smaller wasp
Possibly a male which is usually "smaller". Guessing about 12mm or so which is much smaller than the red paper wasps I see. The male as described in your thumbnail also has the colorful markings.
Do the males hunt spiders as well?

 
Dr. Ascher has settled the ID question :)
With regard to your other question... Females hunt spiders to provision their nests and feed their young. Males don't make nests and thus don't hunt spiders.