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That is what I thought also!
It could have been my camera but I did not enhance the picture. Not that I am familiar with this insect, it looks like the Great Pondhawk to me based on the shape.
The flowers do look similar aside from the color. I dont think they are related though, Brighamia insignis has a small woody trunk and Quisqualis indica is vine. They are also in different classes and orders. I would like to dissect the flowers of each and see a comparison, that would be interesting. I wonder how much of their DNA is shared.