INTEODUCTION TO VOL III. 



With this volume I complete my general Catalogue of the 

 Order Orthoptera, of which Vol. I., containing the Forficulidce, 

 Bemimeridce, Blattidce, Mantidce, and PJiasmidce, was published 

 in 1904 ; and Vol. II., containing the families Achetidce and 

 Fhasgonuridce, was published in 1906. The third volume, 

 containing the Locustidce or Acridiidce (the Short -horned 

 Grasshoppers or Migratory Locusts), is considerably larger 

 than the others, and has consequently occupied a longer time 

 in preparation. 



It had been intended to add an Appendix bringing the 

 Catalogue up to date ; but this was found to be impracticablcj 

 except as regards the third volume ; for a Catalogue so largely 

 facilitates work on the groups of which it treats, that it speedily 

 grows out of date, and in many groups treated of in Vols. I. 

 and II. the amount of recent chanoes and additions has been 

 so large that nothing short of re-editing whole families would 

 be satisfactory. 



As regards Vol. I., Prof. A. N. Caudell published numerous 

 additions in the ' Proceedings of the Entomological Society of 

 Washington,' vol. vii. pp. 84-88. The contents of this paper 

 have been included in our Additions and Corrections (infra, 

 pp. 562-569), and various other omissions to Vols. I. and II. 



