CONTENTS Introduction......................................................................................................................................... 3 Acknowledgements.............................................................................................................................. 8 A list of collecting localities................................................................................................................. 8 Systematic part..................................................................................................................................... 9 Cochylidae........................................................................................................................................ 9 Tortricidae........................................................................................................................................ 12 Olethreutinae................................................................................................................................ 12 Grapholitini.............................................................................................................................. 12 Eucosmini................................................................................................................................. 15 Olethreutini.............................................................................................................................. 44 Tortricinae.................................................................................................................................... 66 Phricanthini.............................................................................................................................. 66 Schoenotenini........................................................................................................................... 66 Polyorthini................................................................................................................................ 68 Tortricini................................................................................................................................... 68 Epitymbiini............................................................................................................................... 73 Archipini................................................................................................................................... 74 A list of treated material...................................................................................................................... 128 References............................................................................................................................................. 129 Alphabetical index of insect names.................................................................................................... 130 INTRODUCTION In the very heart of the island of Sumatra, on the right and left banks of the Alas and the Gajo Rivers, in the so-called Atjeh Region ("Acheen") there extends a wild, densely forested country of not easily accessible mountain ranges