DURHAM DIPTERA. 7 



to that number — where further particulars will be found. A 

 specific name in brackets indicates that the species has not 

 yet been taken in Durham county. A name without a number 

 indicates that it is a European genus or species not yet found 

 in Britain, or not yet included in Mr. Verrall's list. 



To avoid grammatical criticism, please note that, to save 

 space, "each of" is often omitted before plurals which stand 

 for pairs. " Hind femora with the tip black " means " each of 

 the hind femora with the tip black." 



Of course it will be understood that the characters only 

 distinguish between the species here named. The characters 

 will distinguish the species possessing them from any other 

 given in this list, but there may be other species not here 

 given to which the same characters will apply. Therefore, 

 although the tables may indicate the name with considerable 

 probability, to insure more complete accuracy a reference to 

 a full description will be requisite. 



I do not consider it necessary to give any explanation of 

 the abbreviations of authors' names. W. Junk, scientific 

 bookseller, Berlin, N.W.S., publishes a priced list of 900 books 

 and pamphlets on Diptera, which list he will send free to 

 anyone interested, and in which all particulars can be easily 

 obtained. 



