PREFACE. 
THE object of the present Catalogue is to give a complete List of 
all the genera and species of Heteropterous Hemiptera 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. HK. GRAY. 
Brirish Museum, 
V7th April, 1867. 
