Scarab, but not Christmas Beetle, from Mexico

Subject: very large beetle
Location: puerto vallarta, mexico
December 16, 2013 3:17 pm
I found this beetle while on vacation in puerto vallarta mexico
We were there november 30 to december 7 2013
The beetle was dark brown in color and very large in size
Do you have any idea what this is ?
Thank you
Signature: jackie

NOT a Christmas Beetle with Christmas Lights
NOT a Christmas Beetle with Christmas Lights

Dear Jackie,
This is some species of Scarab Beetle in the family Scarabaeidae, but we cannot say for certain which species.  It reminds us of a female Rhinoceros Beetle in the subfamily Dynastinae.  One possibility might be a female
Megasoma nogueirae which is pictured on The Generic Guide to New World Scarab Beetles.  We love your photo with the Christmas Lights.  There is a group of Australian Scarabs which put in their yearly appearance around the holidays (Southern Hemisphere summer) that are known as Christmas Beetles.  While we fully realize your individual is not a Christmas Beetle, we were nonetheless reminded that we will most likely begin getting photos of that group from down under in the near future.

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