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

produce a second, late summer generation. This was probably the case in 1986, when during the days of the First International Congress of Dipterology (on the 19th and 20th of August) several adults of Periscelis (Myodris) annulata were captured in the park on the other side of the street of the congress site. On the other hand, I cannot exclude that overwintered larvae, if they do not get enough sap in spring, may overwinter again. The life-habits of P. (Periscelis) nigra minor L. Papp et Mathis These observations were made in the Péterhalmi-erdő (Budapest, Pestszentlőrinc). That forest is one of the (mostly planted) "park forests" in the suburbs of Budapest with much communal litter and dog feces. However, in some places also numerous elm-trees (Ulmus campestris) were planted and wounds on those trees (frost-cracks and bleeding foots of died twigs on the tree trunks) are those places where most of the adults (over 200 specimens) of this new subspecies were captured. The first adults were caught on the 23 of April. We can exclude that these first specimens developed from second instars overwintered, but of course, we cannot exclude that the overwintering phase was the puparium, or, pharate adult in puparial skin. A majority of the adults were caught on wounds of elm trees (Ulmus campestris), more rarily also on wounds of white poplar (Populus alba) and oak trees (Quercus spp.). The adults seem to cling to the tree they once found: in case of any disturbing they fly up the tree, in numerous cases only to a distance of 0.5 to 1 m, along the tree trunk. A change for a neighbouring tree is at a height higher than 3 m. This is why there is no chance to catch them by sweeping net in the forests, where they otherwise live. The adults feed upon the exuding sap. The first days mainly or exclusively males emerge (see table). Their searching activity is aimed to find bleeding tree barks. As far as I can judge, the males do not keep a "lek" although two males keep a distance from each other if possible. In early spring, or when the first adults emerge, this species (i. e. its males) can rarily be found on all kinds of oozing saps or tree wounds. Later the food of the larvae is only the sap from frost-cracks or from bases of died twigs. The larvae are not found in all kinds of wounds, this is why I think, the females must have the ability to select a proper kind of sap. Females do not visit, consequently, larvae are not found in thicker gelatinous layers of sap, contrarily to the larvae of Aulacigaster falcata and leucopeza. This is easily understandable (and our rearing trials corroborated it) based only on morphological analysis: the caudal stigmatel horns of Periscelis larvae are rather short, and in contrast to the Aulacigaster larvae, these horns are not distended. Table 1. Number of adults and sex-ratio of Periscelis nigra minor (Budapest, Pestszentlőrinc, Péterhalmi-erdő, 1992, and 1995-6). Some samples are from two consecutive days, e. g. 27-28 April, 1996) 2* 2 2 0 1 1 1 2 0 1 day 3 6 8 1 1 6 8 6 1 6 month 4 4 4 5 5 5 5 5 6 6 individuals males 1 5 18 20 11 5 21 11 9 0 101 females 3 0 6 7 4 6 26 11 7 1 71 *1995 only From 26. 04. to 11. 05. differences are significant for males.