This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
Entoman on Apr 7, 2012April 7th, 2012, 10:37 am EDT
Hi Alvin,
Welcome to the forum!
The top critter is a scud of some type.
The other one is a Chaoborus sp. larva of the family Chaoboridae. They are commonly called Glassworms in the larval stage and Phantom Midges as adults. These are aquatic critters of the Diptera order and great consumers of mosquito larvae. Did you find this in trout water?
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman