Albuquerque, E.Z. de Diehl-Fleig, E. Diehl, E. Density and distribution of nests of Mycetophylax simplex (Emery)(Hymenoptera, Formicidae)in areas with mobile dunes on the northern coast of Rio Grande do Sul, Brazil Subjects--Topical Terms: FORMIGANINHODISTRIBUIÇÃO GEOGRÁFICACOMPORTAMENTO ANIMAL