June, '22] 



STRICKLAND: POISONED MOLASSES FOR NOCTUIDS 



215 



disappointing. The largest capture of P. orthogonia at Lethbridge 

 wasSlTcTc^andl? ? ?, the average per "trap-night" being 84.3 cJ* d" and 

 2.03 ? ?. The Retlaw traps captured 41.3 c? cj" and 3. ? ? per "trap - 

 night." Of the total captiire of 34,500 speciments of P. orthogonia 

 which were taken in the field by light-traps 94.97% were males. This 

 percentage was very little better than that obtained in 1913. 



Fig. 6. — The Alf.erta Moth Trap 



1. Trap so arranged that the majority of moths will be retained. 



2. The most suitable type of trapl.for^moth destruction. 



We do not know to what extend the males are monogamous in nature, 

 but it would appear that on this factor alone depends any appreciable 

 benefit to be derived from light-traps. 



We consider light-traps to be unsatisfactory as a general method 

 of control on the prairies for the following reasons: 



