INTRODUCTION. 



This Volume includes the enumeration of the species belonging to the families 

 Acridiidse and Phasmidse. The Phasmidse, as explained in the introductory remarks 

 to that group on p. 343, are placed at the end of Volume II. for the sake of 

 convenience, no other course being possible, our material having been entrusted many 

 years ago to Hofrath C. Brunner von Wattenwyl, to include in his general Monograph 

 of the family. The concluding portion of this important memoir was issued during 

 the past year, just as Prof. L. Bruner was finishing his studies of the Acridiidse. 

 Mr. B-. Shelford then set to work and compiled from it a list of the Mexican and 

 Central-American Phasmids, and a key to the genera and species, which we 

 published in November last (pp. 343-377). 



The available material for the Acridiidse was so very limited, especially from 

 Northern Mexico, that Prof. Bruner has considered it advisable to include in his 

 enumeration all the species that are likely to occur in the region under investigation, 

 those brought in for comparison only being placed in square brackets, as in the 

 Phasmidse and in Volume I. of this subject. The subfamily Tettiginse, the account 

 of which has been contributed by Mr. Albert P. Morse (pp. 3—19), is illustrated by 

 figures in the text ; and the rest of the Acridiidse and the Phasmidse each by four 

 uncoloured Plates, the original drawings for which were made under the supervision 

 of Prof. Bruner and Hoirath C. Biunner v. "Wattenwyl respectively, though they 

 were all lithographed in Vienna. 



The illustrations having been prepared in advance, various alterations in the names, 

 noted in the " List of Plates " and individually in the text, have since become necessary. 



Ed. 



February 1909. 



