The Straight-line Map-wing (Cyrestis nivea) is a butterfly of the Nymphalidae family. It is found in south-east Asia. The habitat consists of primary and secondary forest at elevations between sea level and about 500 metres. Males and females are similar, but females are somewhat paler and have slightly more rounded wings. The larvae are green and covered with tiny pale tubercules. There is a long curved dark purplish spiky horn on the fifth and eleventh segments.