vi INTRODUCTION. 



publications edited by F. E. Schulze, under the general title 

 of ' Das Tierreich.' A revised system o£ classification, by 

 K. W. Yerhoeff, was partly sketched out in 1902, in papers in 

 the ' Zoologische Anzeiger/ vol. xxv., and in the ^ Sitzungs- 

 berichte der Gesellschaft naturforschender Freunde zu Berlin^; 

 but it has been too incompletely developed to be taken into 

 consideration in the present work. 



The (Jollembola and Thysanura have been included by some 

 authors with the Orthoptera, but are now usually regarded 

 either as small independent orders, or as aberrant families of 

 Neuroptera. I have therefore excluded them from the present 

 Catalogue, with the exception of the genus lapyx (or Japyx)^ 

 belonging to the Thysanura, the species of which are all so 

 deceptively similar to Forficididce that I considered it almost 

 necessary to add them as an Appendix to that family. 



The small West-African genus Hemimerus was originally 

 described by Walker as belonging to the Gryllidm {AcJietidce), 

 but is now considered to form a distinct family allied to the 

 Fo7'Jiculidce. 



The Blattidce form a distinct section of the Orthoptera, some- 

 times called Cursoria ; but are not usually regarded as entitled 

 to the rank of a distinct order. 



Previous to the publication of the ^ Biologia Centrali- 

 Americana,^ De Saussure issued a series of important works 

 on the Orthoptera of Central America, especially ' Orthopteres 

 de TAmerique Moyenne : Blattides ' (1864:) ; ' Synopsis des 

 Mantides Americaines ' (1871); and ' Eecherches Zoologiques 

 pour servir a I'histoire de la Faune de I'Amerique Centrale et 

 du Mexique,' 6^« partie (1870-1879). The latter work 

 includes Blattidce, Mantidce, Phasmidce, and Gryllidce. He has 

 also published a valuable series of synopses and descriptive 

 papers on various families of Orthoptera, especially on the four 

 families already mentioned, in various periodicals ; but chiefly 

 under the title of " Melanges Orthopterologiques," in the 

 ' Memoires de la Societe de Physique et d^Histoire Naturelle de 

 Geneve,' vol. xviii. (1863-4), and in subsequent volumes. 



