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With respect to the plan of the work, it may be observed that 
the nomenclature adopted is that of Stainton. In’ giving the 
times of appearance of the Larve it has not been thought desir- 
able to inerease the bulk of the work by specifying the dates 
which would include the whole period of Larvee-life ; the 
time chosen has, therefore, been when the Caterpillar is 
nearly full-fed, except when it is hatched in the autumn and 
feeds up in the spring, when the two dates are given. The 
food of the Larve has generally been ranged under a heading 
when more than one species feed upon it. This grouping of 
the food will much facilitate the capture of the Larve, by in- 
dicating at a glance the various species which feed upon a 
particular plant at a particular time; while identification is 
much facilitated. The time given for the Tmagos includes the 
earliest at which they appear, in ordinary seasons, so that the 
Collector may be able to secure them in the best condition. 
In some months, the number of Insects might have been 
much increased if forward seasons were taken as the guide ; 
but it was thought better to take the average of ordinary years, 
Tf a season is unusually backward or forward, a slight allowance 
is easily made. Space for memoranda, for this and other pur- 
poses, has been provided in the alternate blank pages, which 
arrangement has been thought preferable to the ordinary system 
of inter-leaving. 
Tt is hoped the brief notes wnder most of the months, will be 
found to contain some useful hints; and that the Calendar, 
altogether, will prove a useful Time-curpr to the Lepidopterist 
throughout the year. 
