Hello mauna. The way I told them apart is that the Halloween pennant's dark patches are very distinct with straight edges and in a more rigidly characteristic pattern. In addition, Perithemis tenera's abdomen is also "often" thicker or with a bulge in the middle.
Epicology, I'm curious, how do you tell apart the Eastern amberwing from the Halloween pennant (Celithemis eponina)? Halloween pennant pics below:
http://www.wingwatchers.com/images1/halloween1.jpg
http://bugguide.net/node/view/805259
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