This observation is for the female on the left in the composite image. Found on Asclepias latifolia.
This observation is for the male on the right in the composite image (note the prominent tubercle--the folded-over edge--on the mandible, which is found only in the males). Found on Asclepias latifolia.
At blacklight.
At blacklight.
On Common Milkweed. Not sure what is happening in my 2nd photo (the smaller one was riding the back of one of the larger ones)?