This long legged bug is aptly named the Stilt Bug (Family: Berytidae). With those extra long legs, they look very much like they are walking on stilts. Have you ever tried walking on stilts? For me it was an exhausting feat in and of itself just to get on them, much less try to walk. Fortunately for these guys it comes natural.
Even with those magnificently long legs, these are not very large bugs. They typically reach lengths up to 1/2 inch. When you first come across one of these bugs, you might be quick to think they are mosquitoes, and they actually do resemble them quite a lot. They are really in the order Hemiptera, which are the true bugs and are more closely related to Box Elder Bugs than mosquitoes. They will not sting, bite or otherwise bother you. No itchy welts from these guys. Stilt bugs feed on sweets like plant nectar and possibly small insects as well as insect eggs. Identifying these guys beyond genus is really difficult and usually requires close examination under a microscope. They are a relatively small group of insects with approximately 100 species. A few have transcended from feeding on flowers to sampling our garden crops like tomatoes, or gourds. Some species even seem to need a nicotine fix and feed on tobacco. None of these particular species or their feeding preferences seem to have a damaging affect on the crops. In fact they may actually be there to feed on other insects that are attracted to those same crops. It seems when looking up information on these odd little bugs, there are many conflicting accounts as to their diet.
In the spring they are very plentiful in our backyard, and can be found on all manner of flowering plants. Like the yarrow in the second picture. The first photograph was taken at Happy Holler Conservation Area in September. They can be difficult to see as they are very tiny, thin and non-descript in their coloring. Often they are easily overlooked, but slow, quiet movements through the flowers or vegetation will most likely prove productive and you will see them.