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XXI. Studies of the Blattidse {continued). By R. 

 Shelford, M.A., F.L.S. 



[Read November 21st, 1906.] 



Plate XXX. 



V. The types of Blattid^^ described by Francis 

 Walker, and now in the Hope Museum, 

 Oxford. 



These types are all contained in the collection of Mr. 

 W. W. Saunders which was presented in 1873 to the 

 Oxford Museum by Mrs. F. W. Hope ; the new species in 

 this collection were described by Walker in his "Catalogue 

 of Blattarise " (1868); and in a supplementary volume, 

 " Catalogue of Dermaptera Saltatoria and Blattarise," 

 published in 1869. 



Owing to the inadequacy of Walker's descriptions and 

 to his elastic views of generic limitations many of his 

 species can only be recognized by those who have access 

 to his types. A careful revision of Walker's work on 

 BlattidiB is urgently needed, and the notes here presented 

 are a first contribution towards a complete revision ; 

 thanks to Mr. Kirby's " Synonymic Catalogue of Ortho- 

 ptera," vol. i (1904), the task has not proved so difficult as 

 might have been expected. The species are discussed 

 here not in the order in which they were arranged by 

 Walker, but in the order that they take in modern and re- 

 ceived systems of classification of the BlattidiB. Wherever 

 it has appeared necessary the species have been re-described, 

 but in some cases Walker's descriptions are quite recogniz- 

 able, once the generic positions of his species have been 

 fixed. 



TRANS. ENT. SOC. LOND. 1906. — PART IV. (JAN. 1907) 



