violet-tip
English
Noun
violet-tip (plural violet-tips)
- An American butterfly, Polygonia interrogationis, whose wings are mottled with various shades of red and brown and have violet tips.
References
Polygonia interrogationis on Wikipedia.Wikipedia 
Polygonia on Wikispecies.Wikispecies 
Polygonia interrogationis on Wikimedia Commons.Wikimedia Commons - violet-tip in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913