285 



Mr. Snow said that it had been found by his experiments that the 

 diseases would spread over large fields and destroy nearly all the bugs 

 within 10 or 12 days after the diseased bugs had been introduced, and 

 that the expense was very slight. 



Mr. Webster stated that it had been his experience that the spread 

 of the Entomophthora was entirely dependent upon proper atmospheric 

 conditions, and that he thought the disease might be continued from 

 year to year by massing the bugs on small patches of some favorite 

 food plant or millet where they are to be infected and destroyed and 

 then growing upon this ground some crop to which the bugs are par- 

 tial the next year. In this manner the bugs the following year accu- 

 mulate on the ground where the germs are most abundant and most 

 favorable natural conditions would be offered for starting the disease 

 when proper atmospheric conditions were present. Mr. Webster did 

 not think actual contact necessary for the communication of the fungous 

 diseases, neither did he think that corn fields present favorable situa- 

 tions for the spread of the infection. 



Mr. Snow thought none of the germs would live over winter under 

 ordinary outdoor conditions, but only in protected situations, and it 

 was his opinion that such an attempt as Mr. Webster proposed to carry 

 the germs over from one season to another would not succeed. His 

 own experiments had shown that the diseases can be kept alive in the 

 laboratory through the winter and sent out the next season on demand 

 as explained in his paper. 



Mr. Cook stated that foul brood was readily carried over winter in a 

 beehive and he thought it not unlikely that the chinch bug diseases 

 might be carried over in the same way. Mr. Fletcher thought that 

 where the disease has been it is liable to appear again when proper 

 conditions are present. 



On motion of Mr. F. L.Harvey the committee tendered Mr. Snow a 

 vote of thanks for his interesting and valuable paper. 



Mr. Smith moved that the paper and discussions of the committee be 

 sent to Insect Life for publication. The motion prevailed. 



The committee adjourned. 



C. P. Gillette, Secretary. 



FIFTH CONTRIBUTION TO A KNOWLEDGE OF CERTAIN LITTLE- 

 KNOWN APHIDIDiE.* 



By Clarenxe M. Weed. 



It is evident that before our knowledge of the Aphides can be said 

 to be in a fairly satisfactory condition we must have descriptions, and 



* The first contribution of this series was published in Psyche, vol. v, pp. 123-134 ; 

 the second in P«^c7ie, vol. v, pp. 208-210 ; the third in Bull. Ohio Agricultural Experi- 

 ment Station, 2d series,, vol. i, pp. 148-152; and the foarth in the technical series of 

 the same bulletin, vol. i, pp. 111-120. 



