A contribution to the knowledge of the remarkable fauna of the gypsiferous hills of Los Monegros (Zaragoza, Spain): the genus Platypalpus (Diptera, Empidoidea) with the description of five new species. Bulletin et Annales de la Societe Royale Belge d'Entomologie, 131(1) 1995: 107-125. 116 [Zoological Record Volume 132]