1. Primary succession after a volcanic eruption is a major ecological process, but relatively little is known about insects that colonize barren lava before plants become established. 2. On Hawai´i Island, the endemic cricket, Caconemobius fori Gurney & Rentz, 1978, is known as the first multicellular life form to colonize lava after an eruption from Kīlauea Volcano. In the Kona region, a congener, Caconemobius anahulu Otte,1994 inhabits unvegetated lava flows from Hualālai Volcano, but little...