Narrow-bordered Bee Hawk-moth Hemaris tityus
Wingspan 37-42 mm.
Closely mimicking a bumblebee, this is one of two similar species occurring in Britain.
It appears in May and June and is a lively day-flier, visiting various flowers.
Frequenting marshy woodland and damp moorland, it has a wide distribution in Britain, but is generally quite scarce.
The larvae feed on devil's-bit scabious (Succisa pratensis) and field scabious (Knautia arvensis).