Reconsideration of Some Points in the Morphology of the Head of Homoptera

A great deal has been written about the morphology of the head of Hemiptera, and the Cicada has been the type chiefly used. That there are points upon which there are very divergent opinions is shown by Snodgrass very valuable criticism, where some of the difficulties that confront the investigators are well set forth. This constructive criticism is a type of work far too scarce in American entomological literature and our science would be the better for more of it.