The Bionomics of the Tiger-beetle. 11 
Adult stage (a) within the pupal chamber, eight to nine months, from 
early August 1918 till near the end of April 1919. 
(6) from emergence from pupal chamber till egg-laying, 
about six weeks. 
It was noticed that in the main there is each year a general uniformity in 
the age of the Cicundela population of the locality in which these observations 
were made. Every fourth year (approximately speaking) a beetle year occurs, 
and the intervening years each exhibit larve in a stage of development 
characteristic of the year. But though this is true in the main, it is obvious 
that owing to the unequal start in life given to young larve of the same year, 
some being hatched as early as May, others as late as September, and to 
other causes, no year will be without both adults and larve, and in the year 
of large larve, small ones will always be found. 
I have pleasure in here recording my thanks to Dr Stewart MacDougall 
for his constant kindly encouragement throughout the foregoing investigations. 
(Issued separately, 14th September 1916.) 
