An enormous amount of research in spider biology in recent years has resulted in significant new insights into this diverse group of organisms. The response to this outpouring is an updated edition of this widely regarded classic. First published in 1979, this was the first textbook on spiders since 1930; the new edition contains all the information gathered since that time, including the entire world literature on spiders up to 1994. The author has completely updated and revised chapters on ecology, phylogeny and systematics to reflect current knowledge. Over 200 illustrations are included as well as an extensive reference section. The only modern textbook available on the subject, this will prove an invaluable resource for professionals, students, and researchers in zoology, entomology, ecology and physiology.