The Scarlet Mormon Butterfly, also called the Scarlet Swallowtail, is native to the Philippines. Its wingspan can reach 140mm.
The male (above left) has a basically black topside with streaked hind wings like other male Mormons; the female (above right) has a bright scarlet central panel, but black body.
The female is significantly larger than the male -- coupled above right.
The top of the white markings on the male's hind wings is at a diagonal rather than straight, unlike the Great Mormon's, leaving a black lozenge shape visible above. A red eye-spot is also sometimes visible. The male is tail-less (a similar-looking male, but with tails, is the Ascalaphus Swallowtail).
The underside of the male, above, has bright red markings along the body and a red chain pattern around the hind wing, similar to the underside of the female Scarlet Mormon.
The bright scarlet colouring of the female, above, is on both underside and topside. Bright blue scales are also sometime visible on the hind wing topside, depending on light and age.