Cloudless Sulphur Butterfly Phoebis sennae

Cloudless Sulphur Butterfly male
Cloudless Sulphur Butterfly female
The Cloudless Sulphur Butterfly is native from southern USA through Central America to much of South America; migrants sometimes reach southern Canada. The male, above left, is brighter yellow with one white spot on the underside of each wing; the female, above right, is paler and has two, sometimes joined, white spots on each wing.
Cloudless Sulphur Butterfly underside
Cloudless Sulphur Butterfly male topside
Cloudless Sulphur Butterfly
The male topside, above centre, is plain yellow with a small, muted brown spot on each wing. The female topside is paler, sometimes even white, with more prominent, dark brown spots in the centre and also around the edges of the wings. Wingspan can reach 65mm. Winter forms of both tend to be darker and summer forms paler ("Pale Clouded Sulphur"). Several of the "Sulphur" butterflies look similar.