It has been suggested that antlion larvae foraging strategy depends on environmental conditions in the Australian species, Myrmeleon acer. A previous study found that antlions that were forced to build pits in coarse sand consumed a greater percentage of each prey item than antlions that were forced to build pits in fine sand. I plan to test this hypothesis using the local species Myrmeleon immaculatus. I will use antlion growth rates as an indicator of fitness to assess potential costs or benefits of building pits in different substrates.