HYMENOPTERA SAW-FLIES, ETC. 



177 



is very sluggish) cuts slits in the leaves with her saw-like ovipositor, 

 and lays her eggs in the slits. These hatch out in about two or 

 three weeks' time, feed on the leaves of last year's terminal shoots 

 (at this stage they often eat about half of the leaves see fig. 165), 

 and pupate in July. A portion of those larvae hatch out in August, 

 and thus we get a second brood from a portion, while others remain in 

 the pupal stage (fig. 166) until the following spring. The larva? 



Fig. 165. Foliage of 

 Scots pine eaten by 

 larvce of pine sa w-fly. 

 Injury done by first 

 brood of the season. 



Fig. 166. Pupal case of 

 Lopliyrus pini (pine 

 saw-fly). 



Fig. 167. Foliage of Scots 

 pine eaten by larva of 

 pine saw-fly. Injury 

 done by second brood of 

 the season. 



issuing from the second brood eat the foliage of the current year (see 

 fig. 167). 



In Northumberland the first male of the second brood ap- 

 peared on September 1, 1904, and the females about a week 

 later. 



As this is a very troublesome pest, it follows that some specific 

 remedies ought to be given. Keep the young woods in very good 

 health, and encourage all birds which would open and pick the pupae 

 from their cases. 



The larvse might be collected by chipping off infested shoots 

 and letting them fall into paraffin. The cocoons might also be 

 collected, as far as practicable. For the perfect insects smeared 

 traps might be laid against the young trees in April. It should 



M 



