VI 



the exact names given to the insects in the original descriptions; 

 if an author lias described the same species, at different times, 

 under different generic or specific names, although confessedly 

 synonymous, they will not be found together, but distributed 

 through tlie book in alphabetical order " ; and it by no means 

 follows (though it is generally true) that all the references 

 under the same name refer to the same insect. Where an inac- 

 curate or unaccepted spelling has been employed, the name is 

 corrected and the original form indicated in brackets ; V)ut if 

 the change is in an initial letter (cf. Apithes and Hapithus), 

 both forms are entered as they are employed by the authors 

 and cross references are added. Where both generic and sub- 

 generic terms are used these are both given, but separate from 

 the employ of the same combination of generic and specific 

 name without the subgenus, while cross references again prevent 

 the alternate use from being overlooked. 



As formerly, pains have been taken to include in the list all 

 references to such general localities (especially by old authors) 

 as "America" or "the Indies," even when it was ver}^ question- 

 able whether N'orth America or the West Indies was intended; 

 on the other hand those cases are excluded (when foreign 

 authors are concerned) where no explicit reference to my field 

 is made, even though the name itself suggests the locality, as, 

 6. g., Stoll's Ijocusta Carolina. 



The list of " Literature cited " is practically a complete bib- 

 liography of North American orthopterology, but Avith one or 

 two specified exceptions it contains no references to papers in 

 which the insects are not mentioned by specific names. 



In the preparation of this Index I have received material 

 assistance from Mr. Samuel Henshaw and Miss Harriet Biddle ; 

 and in defraying the cost of copying for the press and the manu- 

 facture of the electrotype plates I have been greatly aided by 

 grants from the Elizabeth Thompsox Science Fund. These 

 plates are now transferred to the Boston Society of Natural 

 History for publication. 



Cambridge, April 13, 1901. 



