The Golden-Winged Skimmer and Needham's Skimmer are very similar in appearance, and Abbott (p. 267) notes, "These two species were long confused with one another."

I believe the above specimen is a female Golden-Winged Skimmer.

"The face is brown in young males and females, becoming bright red in older males. The thorax is brown with two diffuse pale stripes laterally. The wings have a yellow pterostigma with a white coastal vein. The hind tibiae are reddish brown. The abdomen is yellow with a black middorsal stripe ... The wing veins are reddish orange throughout." (Abbott, p. 267).
"Note that lower hindleg is black ..." (Dunkle, p. 129)

This is a male Golden-Winged Skimmer.

The Golden-Winged Skimmer and Needham's Skimmer are very similar in appearance, and Abbott (p. 267) notes, "These two species were long confused with one another."

Compare these two images.