I observed this Ambystoma macrodactylum within half of a meter of this Ceuthophilinaen under an old board. I can imagine salamanders eating cricket-like things, but this question is far outside my expertise. This page says that long-toed salamanders prey on small crustaceans, dipterans and tadpoles at the larval stage, but doesn't seem to discuss their terrestrial diet. Not much about predators on the putative prey's page.
Do Ambystoma macrodactylum predate on ceuthophilinaens like the one I observed?