TERMS EMPLOYED IN THE SYNOPTICAL TABLES. 47 



Observations were made in the south of England ; 

 an allowance of a week or two should therefore l^e 

 made by the collector in northern localities. 



"The typical condition of the gall is": 



"Unilocular and unilarval " : The actual gall struc- 

 ture consists of one larval cell only, and contains one 

 larva only. 



" Pleurilocular but unilarval": The gall structure is 

 made up of more than one larval cell (sometimes as 

 many as, or more than, fifty cells), but that each cell 

 contains one larva only. The expression does not 

 include galls usurped by parasites or tenanted by 

 inquilines. Parasites usually live in cells (e. g. in gall 

 of G. Kollari), but inquilines merely cause cavities in 

 the tissues of the gall. 



" Bilocular but unilarval " : That within the gall 

 structure are two cavities, one of which is occupied by 

 the larva; or that a single larval cell is surrounded by 

 an envelope of gall-substance which may be thin and 

 non-adherent to the larval cell as in Andricvs cwvator, 

 or thick and adherent, as in A. inflator. 



"Parasites, Nos.," "Inquilines, Nos." : To minimise 

 space, and obviate the frecpient repetition of names, a 

 complete alphabeticall}' arranged list of the parasites 

 and inquilines having numbers corresponding with 

 those in the synoptical tables, will be found at the 

 end of the volume. 



As regards the synonyms of the insects, it should be 

 noted that the lists are neither strictly comprehensive, 

 nor do the names profess to be placed in chronological 

 order, nor is reference made to the literature in which 

 they are to l3e found. 



