S. Mahunka szerk.: Folia Entomologica Hungarica 61. (Budapest, 2000)

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK LXI 2000 pp. 5-16 Four new species of the genus Histiostoma Kramer, 1876 (Acari: Astigmata) subsistent in manure and dunghills S. A. Eraky Four new species of the genus Histiostoma Kramer, 1876 (Acari: Astigmata) subsistent in manure and dunghills — Histiostomatic hypopi (heteromorphic deutonymphs) were extracted from manure and dunghills in the animal-farm of Shandaweel at Sohag, upper Egypt. The present study resulted four interesting species, new to science: Histiostoma negmi sp. n., Histiostoma alii sp. n., Histiostoma manuri sp. n. and Histiostoma farghali sp. n. Key words: Acari, Astigmata, new species, Egypt. INTRODUCTION Taxonomic examinations have been carried out in a comparatively large animal-farm (the milk-farm of Shandaweel at Sohag, upper Egypt). Samples were collected for a long period starting from March, 1996 to February, 1998, in order to study the mite fauna inhabiting manure and dunghills. Samples have been taken fortnightly from different habitats in and outside the animal-sheds. The materials were extracted by the help of a modified Berlese's extractor apparatus. The extracted materials yielded different groups of mites, of which four species, proved to be new to science. The descriptions and illustrations of the new species follow hereunder. DESCRIPTION OF NEW SPECIES Histiostoma negmi sp. n. (Figs 1-7) Measurements — Length: 130-132 pm, breadth: 88-98 pm. Habitus: Body approximately ovoid in outline, sides of propodosoma weakly convex, hysterosoma broadly rounded. Dorsal side (Fig. 1): Propodosoma nearly triangular, rostrum evenly rounded, its lateral outlines scarcely convex. A well observable convexly concave band runs parallel