While imaging some Megaspilus armatus specimens, I noticed a unique difference in the front of the head between male and female specimens.
![](https://c1.staticflickr.com/5/4373/37349816186_0901c56fcb.jpg)
While male specimens had rugose or rough sculpturing across the entire front of the head, female specimens had smooth areas. I checked several specimens and it was consistent across specimens from Canada and the USA.
![](https://c1.staticflickr.com/5/4404/36688348234_63eb609a79.jpg)
I’m not sure if this a secondary sex characteristic, a by-product of genetics, or something more, but it is worth noting, especially since it is consistent for this species over a very large geographical distribution.
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