Tiny Thin Black Larvae with a Weird Crawling Method

On the night of July 11, I found a tiny, very thin black insect that seemed to be a larvae. It was crawling up my kitchen wall close to the fridge. A big thing about it that was very weird was its method of crawling. Instead of having many tiny legs like a caterpillar, it had a few tiny legs on the very front and very rear of the lower part of it body. And the way it was crawling was by lifting its rear legs up before lifting its front legs up. After it lifts its rear legs up, it has the shape of a very tight upside down uppercase U.

The state is CT. Environment is a combination of residential, brush, scattered trees of various heights, and a woodlot.