Hey Kevin --
I believe these integrades are becoming more common here on the edge of the eastern Colorado Plains, an east-west mixing zone for the red-shafted and yellow-shafted varieties.
We've had a small number most years in Denver City Park, for instance, over the past six years or so.
But that half-and-half , black-and-red malar you describe is definitely a new variation, to me anyway. Very cool.
The most interesting one I've seen up to now was several years ago, I think also in City Park.
That intergrade flicker's tail underfeathers were split right down the middle in contrasting shades of yellow on one side, red on the other.
Flickers of any coloration are just plain cool.
Patrick O'Driscoll
Denver