A staggered design has the upper wing slightly forward of the lower.

White in color, these covered the upper wing near the leading edge.

Males also have a pale bar on the upper wing.

During one test flight, the upper wing came off the plane.

The black area on the lower edge of the upper wings also differs.

But still he worked on, and the upper wing grudgingly began to level off.

The body is mainly white with grey back and upper wings.

The upper wing in flight shows a pale bar over the brown.

The female is usually entirely yellow with a black spot on the upper wings.