For years several specimens of a Papilio form from Alberta, allied to oregonia Edw., have stood apart in the Canadian National Collection. Time and again I have puzzled over them but could never make them fit exactly under any of the existing names. Three of the series (males) came to us with the Wolley-Dod collection and were captured in 1905 in the bad lands of the Red Deer River Valley, somewhere near Drumheller; a fourth specimen (a female) was taken in the same general region in 1917 by C. H. Young.