54 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 8 



by Doctor Seymour Hadwin, published in the Journal of Parasitology, 

 and also to the expression of a definite opinion by Doctor George H. F. 

 Nuttall of England to the effect that we should no longer hesitate to 

 say that this is a definite disease. The ticks attached and induced 

 the paralysis. They often attach on the base of the skull or along the 

 spine. The paralysis progresses from the lower part upward and the 

 removal of the tick results in a sudden recovery of the child. 



Peesident H. T. Fernald: Mr. F. C. Bishopp has submitted a 

 title and asked for fifteen minutes. He desires to present two short 

 papers in this time. If there is no objection, both will be presented 

 within the fifteen minute time limit. 



[The speaker summarized two papers. One is given below. The 

 other will appear with papers read by title. Ed.] 



NOTES ON CERTAIN POINTS OF ECONOMIC IMPORTANCE 

 IN THE BIOLOGY OF THE HOUSE FLY^ 



By F. C. Bishopp, W. E. Dove, and D. C. Barman, Bureau of Entomology 



The first impression one gains by running over the voluminous litera- 

 ture relating to the house fly or typhoid fly {Musca domestica Linn.) is 

 that our knowledge of that insect and its control leaves little to be 

 desired. To be sure, the admirable investigations of Doctor Howard, 

 Doctor Hewitt, and many other entomologists here and abroad have 

 given us complete and reliable information on the vast majority of 

 points in the life history and habits of this pest and have pointed out 

 means of their practical application. However some points have not 

 been determined while others which have been investigated should 

 receive further attention. The importance of accumulating informa- 

 tion regarding the biologies and habits of insects of wide distribution 

 in a number of regions representing different climatological or eco- 

 nomic conditions, is coming more to be recognized. 



At the suggestion of Dr. L. 0. Howard and Mr. W. D. Hunter experi- 

 ments were undertaken to determine, under Texas conditions, two of 

 the more important biological questions requiring further study. 

 These were the duration of the period from emergence of the adult fly 

 to the deposition of the first eggs (spoken of herein as the preoviposi- 

 tion period) and how the insect passes the winter. It was thought 

 best in carrying out these experiments to broaden the inquiry so as to 

 obtain accurate information on other important points. These in- 

 cluded: The determination of the duration of the different develop- 

 mental stages of the insect, the longevity of adults, the number of 



1 Fublished by permission of the Chief of the Bureau of Entomology. 



