 Antlion larvae eat small arthropods – mainly ants – while the adults of some species eat pollen and nectar , and others are predators of small arthropods . In certain species of Myrmeleontidae , such as Dendroleon <unk> , the larva , although resembling that of <unk> structurally , makes no pitfall trap , but hides in detritus in a hole in a tree and seizes passing prey . In Japan , Dendroleon <unk> larvae lurk on the surface of rocks for several years while awaiting prey ; during this time they often become coated with lichen , and have been recorded at densities of up to 344 per square metre . 
