1910.] Distribution of the Large Larch Saw-fly. 983 



At the commencement of the inquiry (July 20th) in the 

 Welsh area, it was possible to find the saw-fly (a very few), 

 the eggs, and the caterpillars. No saw-flies were seen after 



Fig. i. — Distribution of Large Larch Saw-fly in the Lake District. 



{The small numerals refer to the intensity of attack.) 



July 31st, and no eggs a week later than that date. At this 

 season of the year it is not always easy to detect the presence 

 of the larvas on a tree owing to their small size. The surest 

 means of detection is to search for curled-up ends among the 



