October, '15] BISHOPP-LAAKE: WOOL MAGGOTS OF SHEEP '4^3 



The longevity of the adults when kept without food is very short, 

 from one to three days. When supplied with suitable food, we have 

 observed a longevity of ten to forty days. The period from emergence 

 of the adults to the beginning of egg-laying ranges from four to twenty- 

 one days. Incubation varies much with the temperature, usually 

 slightly less than twenty-four hours are required, but somewhat shorter 

 periods have been observed, and the maximum incubation period which 

 we have noted is seven days. The developmental periods are shown 

 in the accompanying table. 



Table IL Developmental Periods of Lucilia sericata at Dallas, Texas 



Date 

 Eggs 

 Deposited 



Date 

 Hatched 



Incu- 

 bation 

 Period 



Dates of Pupation 



Larval 

 Period 



Dates Adults 

 Emerged 



Pupal 

 Period 



Total 

 Develop- 

 mental 

 Period 



First 



Last 



First 



Last 



1913 



1913 



Days 



1913 



1913 



Days 



1913 





Days 



Days 



July 28 



July 29 





Aug. 3 





5 



Aug. 8 





5 



11 



Aug, 16 



Aug. 17 





Aug. 26 





9 



Aug. 31 





5 



15 



1914 



1914 





1914 



1914 





1914 



1914 







Sept. 4 



Sept. 5 





Sept. 9 



Sept. 10 



4 to 5 



Sept. 14 



Sept. 17 



5 to 8 



10 to 14 











1915 







1915 







Oct. 21 



Oct. 22 





Nov. 5 



Mar 15 



14 to 144 



Dec. 21 



Apr. 18 



46 to 164 



61 to 179 















1915 









Oct. 22 



Oct. 23 



l=t 



Nov. 11 



Apr. 5 



19 to 164 



Apr. 10 



Apr. 22 



150 to 162 



170 to 182 















1914 









Oct. 24 



Oct 25 



l=fc 



Nov. 11 



Apr 5 



17 to 162 



Dec. 5 



Apr, 22 



24 to 162 



42 to 180 









Before 



After 





1915 









Oct. 29 



Oct 30 



1+ 



Feb. 11 



Mar 5 



104- to 126+ 



Apr. 6 



Apr. 19 



54 + to 67 



159 to 172 











After 













Nov. 1 



Nov. 2 



1± 



Nov. 17? 



Mar. 5 



15 to 123 



Mar. 17 



Apr. 15 



121? to 149? 



137 to 166 



1915 



1915 





1915 















Apr. 24 



Apr. 25 



1± 



Apr. 30 



May 3 



5 to 8 



May 10 



May 20 



10 to 20 



16 to 26 



Apr. 25 



Apr. 26 





May 1 



May 6 



5 to 10 



May 14 



May 17 



13 to 16 



19 to 22 



Apr. 26 



Apr. 27 



ld= 



May 2 



May 14 



5 to 17 



May 13 



May 20 



11 to 18 



17 to 24 



Apr. 27 



Apr. 28 





May 5 



May 14 



7 to 16 



May 15 



June 5 



10 to 31 



18 to 39 



Suggestions Regaeding Control 



In this preliminary paper it is not desired to discuss at length various 

 means of repression which may be of value, but a few of the principal 

 points will be touched upon. In order to mitigate the injury due to 

 these species it is essential that greater care be exercised in destroying 

 carcasses of animals. These should be burned as soon as possible after 

 death. In case of shortage of fuel it is sometimes more feasible to bury 

 carcasses, especially of small animals. Preliminary experiments with 

 the burial of carcasses indicate that under most conditions it is neces- 

 sary to cover an infested animal with two feet of earth in order to pre- 

 vent the flies from emerging. If an animal is buried before infestation 

 takes place, a few inches will suffice to protect it from infestation. 



3 



