We can't say positively from the photos, but these may be termite swarmers. Your description of the wings and location is also suggestive of termites. Read over our website info on termites and compare the photos: http://extension.umd.edu/hgic/termites Read over the resources at the bottom of the screens also.

Termites are attracted to wet wood.  You may have a leak around your window or plumbing. You cannot control termites by yourself.  Contact several pest control companies for a visit and  their recommendations before you sign a contract.

ECN

Thank you for your response....I have two sinks side by side.  One has a disposal unit while the other is just with a drain.    Most of the remains were in the sink with just a drain.   There were essentially none in the other sink.   There were some on the window seal as if they tried to get out there.....not in!

That is why I felt they came from the drain upward.   Here are new pictures

From your photos we cannot make an accurate identification as we cannot see all of the body parts. It is possible that the insects may be termite swarmers from what we could see of the antennae and the body.
Termites have two pairs of wings of equal length and you can look for this.  See our website for photos and more links http://extension.umd.edu/learn/termite-identification
mh