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XXVI. Studies of the Blattide. By R. SHELFORD, M.A, 
F.LS. cs 
[Read December 4, 1907.] 
VIII. THe BLATTIDaA DESCRIBED BY LINNZUS, DE GEER 
AND THUNBERG. 
SraL published in 1873, 1874, and 1875 the three parts 
of his “Recensio Orthopterorum. Revue critique des 
Orthoptéres décrits par Linné, De Geer et Thunberg.” 
The families treated in this memoir, which is not only 
a critical review but a revision of genera also, are the 
Acridiidz, Locustide, Gryllidz and Phasmide. Stal re- 
linquished the idea of treating the Mantidze and Blattidze 
in the same way, though in 1877 he _ published his 
“Systema Mantodeorum,” and this contains all the in- 
formation necessary for the correct determination of the 
scanty number of species described by the older Swedish 
entomologists. The Blattide have long been neglected, 
and since the exact determination of the species described 
by the older authors is, in any systematic work on any 
group of insects, a matter of first-rate importance, if 
not an actual necessity, I made it the first object of 
a visit to Sweden last summer to examine in detail the 
Blattide in the collections of De Geer at Stockholm 
and of Thunberg at Uppsala. The collection of Queen 
Louisa Ulrica now at Uppsala contains only three species 
of Blattidze described by Linnzeus, and I assumed that 
the remainder of his types were in the possession of 
the Linnzan Society of London. However, on looking 
over this collection recently I found that such was by no 
means the case, and for reasons given below I believe 
that with one exception those types of Blattide described 
by Linnzus, which are not at Uppsala nor in London, are 
in De Geer’s collection at Stockholm. In my investigations 
I have received the kindest assistance from Dr. Daydon 
Jackson, Prof. Chr. Aurivillius, Dr. Y. Sjostedt and Dr. 
Ivar Tragardh, to all of whom I beg to offer my cordial 
thanks. 
TRANS, ENT. SOC. LOND. 1907.—PaART IV. 
