Part of the Pictured Key Nature Series. This one is, as of this writing (2004), out-of-print and hard to find. Very useful, in that it illustrates all families and many genera of Hemiptera. Widespread or notable species are described in each genus. Almost 500 illustrations.

Additional note 7/6/24. Long out-of-print, and rarity on the used market has caused insane algorithmic pricing. One hopes it will be reprinted eventually in some form. Despite its deficiencies, still a useful reference.