To where?

taxonomic text at the top of the page above your image. You can always tell where your image is by looking there, or by clicking on the Info tab. Either will tell you exactly where your image resides.

Don't take my earlier ID as gospel. This is just what it looked like in a book with tiny, hard to see pictures. That is why I wanted a proper ID for it.

I'm a non-expert, but it sure looks like the Calico Pennant to me. I photographed a number of them this year here in western NY.

They're called Elisa Skimmers in my 1980 Audubon Field Guide to Insects and Spiders and that's what I called them until I bought a dragonfly field guide of recent vintage.

Who changes the names & why? This is happening with birds, too, to make the names more'accurate', if, in many cases, much less colorful.

I don't know about insects, but for birds:

"The AOU Committee on Classification and Nomenclature of North and Middle American Birds ("North American Classification Committee," NACC) is an official committee of the American Ornithologists' Union whose mission is to keep abreast of the systematics and distribution of North and Middle American birds, with the purpose of creating a standard classification and nomenclature. The NACC produces editions of the "Check-list of North American Birds" as well as annual supplements to the latest edition (published in the July issue of The Auk). This classification is subject to constant revision as new data are incorporated."

The Dragonfly Society of the Americas several years ago convened a committee to codify the common names for dragonflies.