Common Name: Alexandra Sulphur, Queen Alexandra's Sulphur
Colias alexandra Edwards, 1863b
Wingspan: 40 - 55 mm
Range: Southern 1/4 of Alberta
Time of year seen: May
Caterpillar's Diet: Pea family plants
Other: There are two brood of the Alexandra Sulphur each year.
One from May 13th to July 3rd, peaking between late
May to mid June and the second from July 23rd to September
1st, peaking in late July to mid August. Female C.
alexandra are white with significantly reduced wing borders. Both
the males and females have a characteristic unringed white discal spot on
the ventral hind wing surface. (Bird et al, 1995 and Acorn, 1993)