The author, Colonel Michael Allen, has thoroughly surveyed and collected moths in various parts of Nepal and other places for about 34 years. He has described here 143 species of them, illustrated by 52 color plates. He has also compared many of these beautiful insects with those of other countries where he has made similar studies as well as collections. The specimens have been carefully identified and documented with reference to the collection of the Natural History Museum, London. The author has been assisted in this photographic venture by another well-known entomologist Colin Smith, an authority on “Butterflies of Nepal”.