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Euphoria kernii on strange flowers and What is it doing there?

Strange flowers because they are not on host plants list, mentioned on Info Page of BugGuide:

"Adults feed on the nectar and pollen of the following genera.
Pricklypoppy - Argemone (Papaveraceae)
Pricklypear - Opuntia (Cactaceae)
Thistle - Cirsium (Asteraceae)
Yucca - Yucca (Liliaceae)"

I have this photo . Euphoria kerni on a plant from Asteraceae family. In this case I'm pretty sure it was more accidentally sitting on this flower, due to weather conditions.
But the BugGuide gallery has some photos which makes me to wonder: what this Euphoria kerni doing there?

On dandelion flower . Well maybe it is just passing by.
But here on marigold flower?
Well, both plants, dandelion and marigold, are in the same family, Asteraceae, even if each are in pretty different tribes (Cichorieae and Tageteae) of Asteraceae family. Different tribe of thistle tribe, Cynareae.
So maybe it is normal to be, occasionally, on another species of Asteraceae like on this Lindheimera texana, from the same Asteraceae family .
But ...
On a Primrose - Onagraceae family ?
On Tradescantia - Commelinaceae family ?
On Asclepias - Apocynaceae family ?
Well, I have never seen this beetle on these plants, neither on Zanthoxylum fagara from Rutaceae family.
So I can't tell you what this Scarab Beetle doing there and ... the question remains open. What is it doing there?

Incomplete knowledge of floral hosts
Incomplete knowledge of floral hosts is common throughout Insect groups. Some insects can be pretty specific, but many others are generalists. So seeing this beetle on so many different flowers is not surprising really.

cetoniines don't seem to have much in the way of specificity to the flowers they visit.

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