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This New World genus contains nine described species classified in the Nemoleontini. Larvae have been found for five species (Miller and Stange, unpublished data). The larvae have only two mandibular teeth and the labial palpus has only 2 segments. These characters are unknown in other genera of the Nemoleontini. Larvae live in dry tree holes (Miller, R. and L. A. Stange, 1983, Description and biology of Acrolophus pholeter, (Lepidoptera: Tineidae), a new moth commensal from Gopher Tortoise burrows in Florida. Proceedings of the Entomological Society of Washington 90:164-178.), in litter under rocks or under tree roots, or (G. gratus) live in Gopher Tortoise burrows (Davis, D. R. and E. G. Milstrey, 1988, The ant-lions of Florida. Glenurus gratus (Say) (Neuroptera: Myrmeleontidae). Florida Department of Agriculture Consumer and Services, Division of Plant Industry, Entomology Circular 251: 1-4.). They are very slow moving except for G. proi which moves faster than the other species.