154858 



Memoirs 



OF THE 



American Entomological Society 



Number 2 



THE BLATTIDAE OF NORTH AMERICA, NORTH OF THE 

 MEXICAN BOUNDARY^ 



By Morgan Hebard 



It has been evident for some time that a number of the names 

 used for the Blattidae of North America have been employed with 

 considerable uncertainty. Many species have been studied from 

 but few specimens, and hardly any comparative work has been 

 done in associating the forms with exotic species of nearest affin- 

 ity. The much larger series now available has led the author to 

 undertake a general study of the North American forms. 



Exceptionally large collections of Blattidae, from the other por- 

 tions of the New World, have assisted greatly in the formation 

 of conclusions as to the relationships and the relative values of 

 many characters of the forms here considered.- Reference to 



' As the title indicates, the present study treats only those forms found north of the 

 Mexican boundary, and North America in this restricted sense is understood throughout 

 this paper, unless further qualified. 



- We have published, during the preparation of the present study, the following papers, 

 all having some bearing on the species here treated. 



"A New Species of the Genus Neoblattella from Costa Rica." Ent. News, xxvii, pp. 

 159 to 161, (March 31, 1916). 



"The Genus Ceratinoptera." Trans. Am. Ent. Soc, xlii, pp. 125 to 134, (April 8, 

 1916). 



"A New Genus, Cariblatta, of the Group Blattellites." Trans. Am. Ent. Soc. xlii, pp. 

 147 to 186, (April 26, 1916). 



"Certain Features found in the Genus Panchlora, with other Observations and the 

 Description of one New Species." Ent. News, xxvii, pp. 217 to 222, (May 2, 1916). 



"Critical Notes on Certain Species of the Genus Blabcrus." Ent. News, xxvii, pp. 

 289 to 296, (June 30, 1916). 



"Studies in the Group Ischnopterilcs." Trans. Am. Ent. Soc, xlii, pp. 337 to 383, 

 (Nov. 15, 1916). 



MEM. .\M. ENT. SOC, 2. 



