Four principal Carbides and several hunting spiders of ca. 125 arthropod species (in 55 families) found in Leptoconops foulki Clastrier and Wirth larval breeding habitats may be influential in natural predation judged by respective host-predator density associations. Highest predator densities were found in the July-October interval, with Omophron dentatus LeConte remaining abundant at all seasons. Predator population densities appeared to rise in response to rising gnat larval densities during summer.