The descriptions I gave in my previous post about the arctics made me realize that some of you may be wondering, "what in the world is a stigma?" and "where is the discal cell?". While some terms such as margin and ventral are somewhat intuitive, other terms require some explanation for those of you who haven't studied bugs since you were two :-)
Using photos of the male Great Arctic from the last post, here is a general overview of the terms you will see me frequently use. Click on the photos to view them full-size.
Update 1/6/2013: I added a separate page to my blog that goes into a little greater detail, see the page Wing Terminology.