S. Mahunka szerk.: Folia Entomologica Hungarica 64. (Budapest, 2003)

tain, with its 2200 m peak looming distinctly above the city of Cali (1000 m altitude), can be reached by a dirt road passing the village of San Antonio (about 1600 m altitude). The summit region of this mountain consists actually of a main peak (2280 m) and two slightly lower peaks which are separated by a saddle-like juncture. The eastern twin peak is covered by a fenced-in telecomunications complex with associated antennas and support buildings, while the western summit, some 200 m farther west, and the main peak are vegetationally in its natural state. The mountain's slopes are covered with primary forest consisting mainly of broadleafed arboreal species. About 10 m beneath the eastern summit there is a path downhill from the dirt road which follows a narrow ledge with a precipitous drop of several hundred meters just to its side. Some tens of meters downhill, where the shrubbery lining the dirt road gives way to the forest trees, there is a tiny opening around a small rock outcrop where one can stand. The particular topography of this site puts part of the canopy region of 20 to 30 m tall trees within reach of a tropical net provided with a 4 m handle. These uppermost trees, including the shrubbery and even the dirt road itself, constitute a real entomological hot spot, where winged insects are extraordinarily abundant during most of the year. All hitherto known Colombian A. dahnersi specimens have been collected on this spot, most of them in the canopy and a few on perching sites situated slightly lower around the above-mentioned rocky outcrop. The site has a high diversity of lycaenid butterflies: more than 60 species of Theclinae have been recorded previously, some of them still unidentified. Behaviour - Adults of A. dahnersi occur in small numbers at the collecting site described above during all of the year; A. dahnersi appears most abundant in July/August (see paratype data). Males congregate near this spot, perching on the uppermost leaves of trees, mostly broad-leafed Ficus species. When something airborne comes near them, they take off very quickly and either engage in mating flight attempts or soon fly to another perch. Of course, given the site's high insect density, most of the mating attempts are to no avail. The presence of Aveexcrenota anna (Druce, 1907) (Eumaeini, Lycaenidae) males, which show a very similar behaviour, prove a real nuisance to collecting A. dahnersi, since members of the two species keep each other quite agitated. The butterflies' behaviour could be considered "hilltopping", only that the actual mountain summit, being occupied by antennas and buildings, is not a suitable habitat. Thus, alternatively, these rock outcroppings over the canopy provide a makeshift hilltopping site. On the main and the western summit, whose original vegetation is intact, Atlides browni can be found genuinely hilltopping.