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Wide spread across Europe, H.angustipennis hatches between April and September. It tolerates warm water. I usually find thousends of them in a small stream nearby during May
Ventral view
Spur formula: fore tibia 2, mid tibia 4, hind tibia 4. Well visible in the picture above the 4 mid tibial spines
Head, maxillar palps and antennae details
Genitalia lateral view through optical microscope x25
Genitalia detail through optical microscope x100, ventral view
Abdomen end and genitalia detail through optical microscope x100, dorsal view
Forewing
Hindwing