410 3Iaterials for a 3Ionog'raph 



Vegetation," which, though very meagre indeed, is yet a 

 fuller treatment of them than has been given by him to 

 any other group in his Report ; and De Saussure's short 

 diagnoses of new species in the " Revue et Magasin de 

 Zoologie," about three years since, which have reference 

 principally to tropical forms. 



My earliest intention in this paper was to restrict my- 

 self to a critical revision of the Orthoptera of New Eng- 

 land, known to me, whether described or undescribed; 

 and this has continued to be the main purpose of the 

 article, in its present form, — more enlarged, because it 

 was readily seen that a much better understanding might 

 be obtained of the peculiarities of its fauna by compar- 

 isons, the more extended the better, with species closely 

 allied from without its limits. This has been the case, 

 particularly among the Locustariae ; and it is hoped that 

 some better understanding may thereby be had of the 

 Orthopteran fauna of the whole of North America.* 



To further my purposes I solicited the assistance of 

 many of my friends, and have invariably received their 

 kindest cooperation. The original collection of Dr. T. W. 

 Harris, in the Society's possession, has been invaluable to 

 me ; for by it I have been enabled to know exactly the 

 extent of his knowledge of our fauna, as well as to de- 

 termine his species directly from his types. The collec- 

 tion of the Museum of Comparative Zoology has been 

 of great assistance to me, — containing as it does many 

 species I could not otherwise have seen from the southern 



*Tlie whole number of species mentioned is 115, of which 78 are found iu New 

 England, distributed among the different families as follows: — 



Whole No. From New England. 



Forficularia; 2 2 



Bliittariic 9 7 



Phasmida 1 1 



Gryllides 14 11 



Locustaria) 41 18 



Acrydii 48 41 



115 7a 



