I hate making mistakes with important details like the size measurement. You are correct, Lloyd, it was only 14mm long and not the 21 mm that I had originally posted.

Maybe this is a good time to explain how I make my measurements. If it's a 'posed' shot of a bug that I've captured, then I use a ruler and directly measure the individual through the glass sides of the container that I've used to capture it. If it's a totally in-the-wild shot, like this one, then I make use of the unique features of my Canon MP-65mm 1x-5x macro lens. Since this lens has no focus adjustment, if I use the 1x setting to photograph an object from a perpendicular direction, then all in-focus images are recorded on the sensor at a size that is directly proportional to their actual size. I have photographed a standard millimeter rule using the same camera (1.3x crop) and lens at 1x. The first field shot I take of any bug is always at 1x and perpendicular to the bug. As long as the focus is reasonably good, this image allows me to 'measure' the length of the actual bug during post-processing of the image by superimposing my 1x ruler image on the 1x bug image. What happened to cause my error on this image was that I accidently missed the first image of the series and used the second image in the series instead (which was zoomed in more than 1x) to 'measure' the caddisfly. When you questioned the length, I went back to my original series of images of this individual and found that I had overlooked the 1x image. Getting the correct measurement was then just a matter of 'measuring' the 1x image that I should have used in the first place.

That's a great trick, Mardon. I wish I could give you a better ID on this one, but unless a combined Hydropsyche/Ceratopsyche genus page is set up, most of the hydropsychids will probably stay at family level. Even if there were such a page, it would be fairly difficult to be sure that a few Cheumatopsyche weren't mixed in. Based on size, however, your specimen fits Hydropsyche/Ceratopsyche without too much doubt.