The present publication is an attempt to fill a gap in entomological literature. The book is useful for the undergraduate and post-graduate students specialising in entomology, ecology, parasitology, and associated subjects of several Indian universities. However, it is hoped that others who are interested in parasitic insects and especially those such as agriculturalists and veterinarians who come into contact with them professionally, will find it of some value as a reference text. The book includes Parasitic Hymenoptera, Bedbugs and other Hemiptera, Fleas, Mites, Lice, Ticks, Blood-sucking flies, Parasitic Arthropods, Various Parasitic Diseases, Mouthparts of Parasitic Adult Insects, Embryonic Parasitic Insects and Sarguivorous Vectors of Human disease etc.