PKEFACE. 



The object of the present Catalogue is to give a complete List of 

 all the genera and species of Hemiptera Heteroptera known to 

 exist in the collections of European and American Entomologists. 

 The letters a, b, c, &c, after the species, denote the specimens now 

 contained in the British Museum, followed by the habitat and the 

 mode in which each of them was obtained ; and the absence of 

 these letters indicates the species which are desiderata, and there- 

 fore desirable to be procured for the collection. 



J. E. GRAY. 



British Museum, 



April 17 th, 1873. 



