ABSTRACT
S orne of the primitive Homoptera are of very much the same appearance as the Hemiptera, although some other species are hardly even recognizable as insects. Several distinctive features to be described subsequently are shared by many of the diverse forms assigned here. Individuals of many species are exceedingly abundant. As a group, the homopterans are perhaps the most detrimental order of insects, not only because of the economic loss they cause by damaging crops and ornamental plants but because they are vectors of plant pathogens.
