Fig. 2. Scanning electron micrographs of the surfaces used for the measurements of the pulling forces of the beetles: (A) a glass microscope slide, (B) photographic paper, (C) a fresh leaf of Glyceria maxima, (D) a fresh and (E) a dry leaf of Phragmites communis and (F) filter paper. (G) Lateral view of the contact zone between the tarsal tenent setae (ts) of tarsomere IV of Stenus pubescens and a dry Phragmites leaf. Scale bars: A—F, 100 µm; G, 3 µm. The plant surfaces represent the adaxial surfaces of young (uppermost) leaves of plants collected in the field. Fresh leaves of Glyceria maxima and Phragmites communis were observed directly using low-voltage scanning electron microscopy, whereas all the other surfaces were air-dried and gold-coated before examination at high voltage. wb, wax blooms.