This would be my first time seeing one, but I'm fairly positive that this is a Snakefly, and from viewing the images in the Guide I think that it is likely Genus Negha. As you can see from the picture, I found this female floating in my landlord's pool. Unfortunately, she did not revive after being rescued, so I did my best to take a good series of photos so that her death would at least be of some benefit to those of us in the insect community.

I have read that there are only three species within the Genus Negha, but thus far none of the images in the guide have been identified to this level. Does anyone know if it is possible to determine species? If so, please let me know if the necessary characteristics for an ID are unclear as I have many other photos that I have not posted. Thanks!

[UPDATE: If interested in seeing a similar series showing a male of this genus, please click here.]