CLOSED: Can you identify a large flying insect

Last night in Grand Rapids Michigan I saw a large insect caught in a spider web. It was just outside of a window so I was able to view it very closely. I was also able to watch the spider work diligently to secure his large catch which was facinating.

Description: Length of this 4 winged insect was about 2-2.5 inches long. 3 major segments. The rear segment being the majority of it's overall length and was segmented itself. The 4 wings were 1.5 inches each and much longer than wide. The wings were white with brown streaks the length of the wing. The head somewhat like a praying mantis. Wide and articulate with bulging wide set black eyes. The mouth was much simpler though. It appeared to just have two pincer type parts. The 6 legs were gathered close together and had no remarkable features. The light grayish body was substantial but relativly skinny to it's overall length.

If this guy is still in the web later today I will submit a picture. Thanks to anyone that can identify this guy.

Two possibilities come to mind, an antlion (Neuroptera: Myrmeliontidae) adult - see http://farm1.static.flickr.com/55/152129756_278cd8b7f2.jpg?v=0, or (less likely) a dobsonfly (Megaloptera: Corydalidae) - see http://pics.davesgarden.com/pics/kev1701e_1163997495_808.jpg
Awaiting your photo...

Here is a pic though not very good. The background is so bright that I need to use flash and that is bouncing off the window. The flash make the wings look more translucent than they are. The brown streaks on the wings in my first description are actually more of dash lines than streaks. Also, this guy is hanging from a spider web and is almost dead. He'll make a great meal as he's 50 times bigger than his capturer spider. I will try to get a better photo if it will help. just let me know.

I think that it may be a female dobsonfly, but a photo showing the head more clearly would help. They have short but strong mandibles that cannot be seen in the current photo.

Well the spider has decided not to dine on his huge catch so I'll retrieve it and get some better photos. One thing I noticed was that the antennae are feathered.

Looks like we have a Dobson Fly, agree?

One more shot.

Or maybe a Summer Fishfly? I found the following link.
http://www.whatsthatbug.com/images/fishfly_jesse.jpg

Yuppers - You got it, it's a female dobsonfly all right. The males have much longer (but less painful) mandibles - see http://www.svbnc.org/images/dobsonfly.jpg for an image - they can barely deliver a pinch whereas the females can draw blood if handled carelessly.

Oops, my bad - Frank Thomas is right - I'd overlooked the pectinate antennae characteristic of the genus Chauliodes. Dobsonflies (Corydalis spp.) have filiform antennae. They both belong to the same family (Corydalidae). My sincere apologies for my mistaken i.d.

This was fun. My first experience on Dave's Garden. Thanks suunto.