12 INTRODUCTION, 



and was only hidden from my observation by its anonymous title. But I made a 

 diligent inquiry for a work, agreeing apparently in design with the plan which I had 

 ibrmed for ray own undertaking ; and by the kindness of A. H. Haworth, Esq., of 

 Chelsea, I was made acquainted with the Systematic Catalogue of the Lepidoptera 

 FOUND IN THE NEIGHBOURHOOD OF ViENNA (^Si/stematisckes Vcrzeichnis der Schmetter- 

 linge der Wienergegend, herausgegeben von einigen Lehrern am k. k. — Theresianum.) 

 On further investigation I found that it was the production of the united labours of 

 Messrs. Denis and Schieffermiiller, two distinguished officers of high rank at the 

 court of Vienna, who from their charge in the Imperial Academy, are known in 

 Germany by the name of " Theresianer," and their book by that of " das System 

 DER Theresianer." 



On opening this book, I made a discovery which filled me with inexpressible delight. 

 Although the work was published more than half a century ago, I found, in the families 

 into which the larger subdivisions are distributed, clear indications of almost all the 

 genera that have been established in more recent periods, in the whole order of 

 Lepidoptera. In the tribe of Papilionidce, I observed the genera accurately deter- 

 mined and circumscribed, almost without a single modification, as they are now 

 universally adopted ; and, to illustrate this statement, I proceed at once to the 

 following abstract of the families and species of the Linn^an genus Papilio, taken 

 from the body of the work, viz. 

 Familia A. Larvae Tortriciformes. Papiliones Plebeji. — Urbicolce, L. Wiener Ver- 



zeichnis 159. 

 Species enumerated by Denis and SchiefFermiiller. Papilio Malvae, L. P. Tages, L. 

 P. Fritillum, Wien. Verz. P. Comma, L. P. Linea, Muller. P. Brontes, W. V. P. Ste- 

 ropes, W. V. 



Fam. B. Larv^ Bombyciformes. Papiliones Heliconii, L.* W. V., p. 160. 

 Species : P. Apollo, L. P. Mnemosyne, L. 



Fam. C. Larvje Variegat^e. Papiliones Equites, L. W. V., p. l6l. 

 Species : P. Polyxena, W. V. P. Machaon, L. P. Podalirius, L. 



Fam. D. Larvae Mediostriat^. Papiliones Danai candidi, L. 



Species : P. Crataggi, L. P. Brassicse, L. P. Rapse, L. P. Napi, L. P. Sinapis, L. 

 P. Daplidice, L. P. Cardamines, L. 



Fam. E. Larv^ Pallidiventres. Papiliones Danai Flavi, W. V., p. 164. 



Species : Sect. 1. Die Fliigel ein wenig zugespitzt, indicating the Genus Gonepteryx of Dr. 



Leach. P. Rhamni. 

 Sect. 2. Die Fliigel ganz rund mit schwarzem Auszenrande. P. Palaeno, L. P. Hyale, L. 



Fam. 



* As originally employed by Linnaeus. By Gmelin, Fabricius, &c. this name is applied to a diiFerent group. 



