S. Mahunka szerk.: Folia Entomologica Hungarica 59. (Budapest, 1998)

The other reason why adults are so rarely collected is, that they are more alert than some other flies. I caught most of the specimens with a strong aspirator. However, the safest way to catch a periscelid - while it is sitting on a wound - is to cover is very quickly by a vial of ca. 25 mm diameter and longer than 10 cm. (We are quicker than they in the first tenth of a second, which is decisive.) The adults mostly spring into the vial, when covered. Larvae They were not collected by anybody for decades of modern dipterology just by chance, since the Periscelis adults and larvae are not only much rarer than most of the other flies but their life-habits are so special. I collected larvae below wounds of trees together with soaked bark pieces, cutting out bark in its full thickness, and picked out larvae from under a stereomicroscope. There is no chance to sight the larvae and they are not to be found in the sap itself. One stands for better chance to get larvae from wounds where females were collected formerly. Acknowledgement - My grateful thanks are due to László Ádám for advice and help with collectings. LITERATURE Bächli, G. (1997): Die Arten der Tanypezidae, Dryomyzidae, Periscelididae, Acartophthalmidae, Aulacigastridae und Stenomicridae in der Schweiz (Diptera). -Mitt. ent. Ges. Basel, 47 (1): 29-34. Papp, L. (1984): Family Periscelididae (Periscelidae). In Soós, Á. and Papp, L. (eds): Catalogue of Palaearctic Diptera. Akadémiai Kiadó, Budapest, 9: 233-234. Papp, L. (1988): Periscelis kabuli sp. n. and P. kaszabi sp. n. with notes on larvae and pupae of the families Aulacigastridae and Periscelididae (Diptera). - Acta zool. hung. 34 (2-3): 273-284. Papp, L. (1995): Morphology of Periscelis annulata third instar larva and Turanodinia tisciae larva and puparium (Diptera: Periscelididae and Odiniidae). - Acta zool. hung. 41 (1): 15-24. Polgár, A. I., Darvas, B. (1995): ízeltlábúak alkalmazkodási stratégiái III. Hipobiózis: dormancia (kvieszcencia, diapauza) és kriptobiózis. Növényvédelem 31: 369-380. [in Hungarian] Teskey, H. J. ( 1976): Diptera larvae associated with trees in North America. - Mem. ent. Soc. Can. 100: 1-53. Teskey, H. J. (1987): Chapter 5. Key to Families - Larvae. Vol. 1, pp. 125-147. In: McAlpine, J. F. et al. (eds): Manual of Nearctic Diptera, Research Branch, Agriculture Canada, Ottawa. Agric. Can. Monogr. 21, vi + 674 pp. Author's address: L. PAPP Hungarian Natural History Museum Department of Zoology Baross u. 13. H-1088 Budapest HUNGARY