A friend (who's reasonably bug-savvy in the first place) has some bugs in the basement of a house he's caretaking.
They look somewhat like crickets, although the shells aren't as thick and defined. They also don't have any sort of wings. They have very long thin whip-like antennae. They congregate in large groups in cool dark places. They also seem to like to jump. The boddies are mottled brown (different shades of brown). They don't chirp or make any other 'noise'.
They're found in central NJ on a family farm.
Any clues what they might be?