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

of males in Tiszapüspöki in the end of June 1993 and in Ócsa in the beginning of June 1995. On the same places I observed them often, while they hover in large numbers under the trees above stinging nettle. I tried to collect females as well, but even sweeping through the nettles proved unsuccessful. Beris chalybata (Forster, 1771) After studying the key in the Fauna Hungáriáé one may come to the conclusion that B. chalybata is a typical mountain species. This, however, is not true. Although I collected a nice series in the Pilis, 1 collected further specimens in a wet forest in Ócsa from the end of April till the end of May. Yet it may not be called a very common species. They may be found, while they seem to enjoy the sunshine on leaves of bushes at the skirt of forests. Chorisops nagatomii Rozkosny, 1979 I collected this species in the forests of the Great Plain. In early autumn they seem in some places very common. Not rarely I counted hundreds in a small area. I took specimens from Péterhalmierdő, Ócsa and Csévharaszt. Chorisops tibialis (Meigen, 1820) It may be collected in the same places as C. nagatomii, yet it seems much less common in Hungary. Anyway, I was able to collect quite a number of specimens. Compared with the previous species its abdomen is darkish, because the yellowish 3rd -5th abdominal tergites have broad black margins. The females are very easily distinguished by the wing of the female since it has a dark brown stigma, while the female C. nagatomii has a pale yellowish/brownish stigma. Sargus bipunctatus (Scopoli, 1763) According to the Fauna Hungáriáé S. bipunctatus is a rare mountain species. Actually it is not rare at all and may be collected in the low land as well. It is a typical species of late autumn. In my collection I have many specimens, mainly collected in October, from Budapest, Ócsa, Inárcs, Gödöllő, Budakeszi and Budaörs. They are often found, while sitting on leaves in the sunshine. Owing to its bif size it is easy to detect. Peculiarly the males are more rarely collected. Sargus cuprarius (Linnaeus, 1758) S. cuprarius seems to be very rare. I only once collected two males on the same occasion in a small wet forest in Tiszapüspöki on July 1st 1992. I caught them, while they warmed themselves in the sun early in the morning. Some years later, in 1996, while on holiday in Poland, I observed hundreds of specimens on willow-trees besides a fast brook near Frydman. It was a most extraordinary experience to observe so many specimens of this rare species per square meter.