Introductory 



Logotype, a type by subsequent designation. 



Pseudotype, an erroneous type designation. 



In the terminology I have uniformly used the endings idae for 

 families, inae for subfamilies, M for tribes and aria for divisions or 

 subtribes, thus changing the terminations of divisions where they had 

 been used as tribes by Renter and others. All genera have been con- 

 sidered as nomina nuda until a type can be fixed, thus invalidating 

 all genera founded without the mention of a described species. These 

 become valid and date from the naming of an included species that 

 is recognizable and available as type. On the contrary a genus pub- 

 lished in a systematic work, without a description but with distinct 

 indication that it was established for a previously described valid 

 species, has been accepted. This, however, does not include mere 

 catalogue names unless they are given to replace a preoccupied name. 

 The changes from either of these causes are very few in the North 

 American Hemiptera. The most important are the use of Tibicen for 

 Cicada of Stal and most recent writers, Meadorus Mulsant and Bey 

 for Elasmucha Stal and Corecoris Hahn for Spartocera Laporte. The 

 new genera established in the first part of Fieber's Die europaischen 

 Hemiptera published in 1860 are nomina nuda there and are not 

 recognized until they appear in the later pages with the mention of a 

 species. Amyot's monomials, validated later by Kolenati, have been 

 credited to the latter author and date from the publication of his 

 descriptions. 



I might add that priority, whether in the name of a species, genus 

 or of a higher group, has been strictly followed throughout this cata- 

 logue so far as such priority was susceptible of proof. 



No attempt has been made to include every published reference 

 to each species, but I have tried not to omit one giving a useful 

 description or figure or one that is of interest in extending the geo- 

 graphical range of the species. All references effecting the synonymy 

 and history of the species, genus or family have been included. Our 

 knowledge of the distribution of our species is still too fragmentary 

 to allow the satisfactory naming of a "habitat" so I have contented 

 myself with recording, by states only, the known or published locali- 

 ties of capture. 



It has been my endeavor within each genus to arrange the species 

 systematically so as to show their relationships. But in the genus 

 Arctocorixa this was impossible and in certain other genera it has 

 been but imperfectly accomplished. 



xii 



