Pionowe i poziome parametry wylotu Ophiogomphus cecilia (Fourcroy, 1785) (Odonata: Gomphidae) w małej rzece nizinnej

Short note on horizontal and vertical parameters of the position of Ophiogomphus cecilia exuviae in the bank zone of small lowland river. The measurements of 111 exuviae positions were made. The average height on whitch exuviae were found was 77 cm (min. 11 cm, max. 172 cm, most often from 60 to 120 cm), the average distance from the bank line was 43 cm (min. 0 cm, max.210 cm, most often from 0 to 50 cm )