99 



about 81,000 and has only partially eradicated the pest, and has since 

 been constantly on the outlook for another outbreak. In one instance 

 a stock of 30,000 pounds of leaf tobacco had to be fumigated in order 

 to destroy the insect. In this connection it may be said, from our 

 experience in using the two gases, carbon bisulphid and hydrocyanic- 

 acid gas, we find the latter in general to be more effective. But in 

 using either in fumigating large quantities of tobacco done up in 

 cases of 350 pounds, it is difficult for the gas to entirely penetrate 

 the ease. In my opinion, tobacco warehouses should be inspected by 

 an entomologist, who should issue a certificate to show that the build- 

 ings are apparently free from this pest. In this way the manufacturer 

 would be protected from serious loss in purchasing tobacco that is 

 infested with the insect. 



Mr. Sanderson stated that the best remedy that he had found for 

 Antlionomus sighatus was to burn over the strawberry beds. 

 Mr. "Washburn next presented a paper entitled — 



INSECTS OF THE YEAR IN MINNESOTA, WITH DATA ON THE 

 NUMBER OF BROODS OF CECID0MYIA DESTRUCTOR SAY. 



By F. L. Washburx, St. Anthony Park. Minn. 



Plant-lice of various kinds have been extremely numerous this 

 year, notably a grain plant-louse which for a while caused serious 

 alarm among the farmers. It may have been either Xedaropliora 

 cerealis or X. granaria. It was well taken care of by parasites. 



Eggs of apj)le aphides hatched in April, but a cold snap with some 

 snow and sleet killed the young lice. 



Two strawberiw insects did some damage, Antlionomus signatus 

 Say, and Corimelcena sp.? 



A wholesale grocer in St. Paul complained to this office of a trouble- 

 some mite on dried figs from California and dried apples from Xew 

 York State in a storage warehouse. This proved to be, according to 

 Banks, Carpoglyphus passularum Hering. 



This year has seen numerous leaf-miners on oak trees, notably 

 LithocoUetis hamadryadeUa Clem., which was extremely destructive 

 on various kinds of oak, particularly white oak, in the vicinity of the 

 twin cities, but was not observed in other parts of the State. 



Specimens of Tribolium confusum were sent to the laboratory from 

 an elevator, and while being used in some laboratory experiments a 

 few escaped; we afterwards found one attacking a dried insect speci- 

 men in an imperfect insect box, not an unusual habit of this omnivo- 

 rous pest. 



