The Plain Tiger, also known as the African Monarch, is a medium-sized (wingspan of 7–8 cm) butterfly widespread in Asia and Africa.
The male Plain Tiger is smaller than the female, and more brightly coloured.
There are three subspecies:
1. Danaus chrysippus chrysippus (Asia, Mediterranean region, eastern tropical Africa);
2. Danaus chrysippus alcippus (western, central and eastern tropical Africa, Cape Verde Islands and Middle-East). This subspecies has a white patch on the hindwings;
3. Danaus chrysippus orientis (central, eastern and southern tropical Africa, including Madagascar, Comoros, Seychelles and Mascarenes.

In 2010 another subspecies was recognized by some authors: Danaus chrysippus dorippus which actually five years earlier by some auhors was recognized as a full species: Danaus dorippus.
However, since 2015 this taxon seems no longer accepted as a subspecies or as a full species.

This is the subspecies Danaus chrysippus orientis. 

Dr. David Lees from the Department of Zoology of the University of Cambridge, United Kingdom, helped me identify this butterfly.
David Lees has extensive field research experience in Madagascar and is considered the authority on Madagascar butterflies.
I was very fortunate to meet him when I visited Madagascar in January 2014.

1st photo: Andasibe-Mantadia National Park, Madagascar, 15 January 2014
Other photos: Mananara Lodge area, Anjozorobe, Madagascar, 17 January 2014