r.: Butterfly; v.: Butterfly with chequered wings were intended for publication in Whistler 1899 (US)[more].
Butterfly, Pennell Collection, Library of Congress, Washington, DC
Butterfly with chequered wings, Pennell Collection, Library of Congress, Washington, DC
The sheet is catalogued in MacDonald 1995 (cat. rais.) [more] (cat. no. 1579).