26 JOURNAL OF ECONOMIC ENTOMOLOGY [VoL 3 



of the vivarium. Psychoda alternata was relatively abundant in mid- 

 summer about stations 23, 6 and less so at station 12. Toward the end 

 of the season some were observed at station 18. This latter occurrence 

 may possibly be explained by a mouse burrow admitting a small 

 amount of liiiht in the near vicinity of the pail. 



Conclusions. The above data, while not so conclusive as could be 

 desired, show that the house or typhoid tiy does not breed freely in 

 darkness. This pest exhibits a decided preference for sloppy filth in 

 light places. It is practical and thoroughly in accord with the best 

 agricultural practice to either draw out and spread manure at fre- 

 quent intervals, or to store it in cellars or sheds. The relatively cheap 

 cement underpinning makes it comparatively easy to construct dark 

 cellars, places where manure or other fly-breeding material can be kept 

 without producing swarms of flies. These measures, while particularly 

 adapted to the farm, will also prove of service in villages and cities. 



Mr. Hewitt : As one who has been working on this question for 

 some years, I should like to thank Doctor Felt for his interesting 

 paper. I have found my own observations exactly coincide with those 

 of Doctor Felt ; that is, that flies breed more abundantly under bright 

 conditions than in dark places, although the flies crawl down into the 

 dark crevices to deposit their eggs. 



A Member: Will not flies oviposit in the manure before it can be 

 removed to the dark cellar or pit? 



Mr. Felt : I think it makes no particular difference whether the 

 eggs are deposited in the manure or not, since, if there is considerable 

 breeding, it is comparatively easy to arrange a light though flyproof 

 trap which would attract the flies and prevent the insects escaping 

 from the manure cellars or pits. 



Mr. Cooley: I would like to ask whether the temperature inter- 

 feres in any way. Was the house as warm as the area outside ? 



Mr. Felt: If Professor Cooley could have entered the fly viva- 

 rium, he would have agreed that the flies had a pretty warm 

 reception. It was quite warm at times. The house is standing, and 

 will probably be used another year. 



President Britton: The next paper on the program will be read 

 by Professor Sanderson, Durham, N. H. 



