Scarab Beetle from Ecuador

Subject: jewel scarab of some sort?
Location: Ecuador, Pichincha province
July 8, 2017 5:23 pm
Hi. I saw this beetle in the cloud forest of Ecuador but have been unable to identify it. I’ve narrowed it down to some variety of jewel scarab (Chrysina sp.). Perhaps you could help me?
Signature: Camille

Scarab Beetle

Dear Camille,
We will post your image of a male Scarab (note the antennae) and attempt to determine a genus and species identification for you.  Perhaps Cesar Crash from Insetologia will recognize this Scarab Beetle.  We looked at the genus
Chrysina on the Generic Guide to New World Scarab Beetles and no pictured individuals have a scutellum shaped like the one on your individual (see BugGuide where it states: “The scutellum typically forms a small posteriorly-pointing triangle at the base of the folded wings”), so we are not convinced that genus is correct.  This image of Calomacraspis haroldi on the Generic Guide to New World Scarab Beetles has a scutellum shaped like your individual.  Following that lead regarding the subtribe Anticheirina, we believe your Scarab might be Dorysthetus taeniata, which is pictured on the Generic Guide to New World Scarab Beetles.

Thank you so much Daniel! You are right about the shape/size of the scutellum. I noticed it but didn’t know what it was called or how to search for that difference. You are probably right about the genus Dorysthetus, but I’m not so sure about the species of Dorysthetus taeniata (at least compared with the photos I can find online). There is a lot of green edging on the scutellum as well as the insect’s nose area and eyes. Also, you can’t see it as well in this photo, but there are 4 light-colored spots along the very back sides. This is close enough for my labeling purposes although if you find out more, I would love to know for sure.
Thanks again!
Camille Lamoureux

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