Ongoing, feel free to contact me with omitted species and evidence of their availability past or present in the UK. Thanks, Viv.
Neptis hylas, the common sailor, is a species of nymphalid butterfly found in the Indian subcontinent and South-East Asia. It has a characteristic stiff gliding flight achieved by short and shallow wingbeats just above the horizontal. For the other butterfly called the common sailor, see Neptis laeta.