110 



THE EEPOET OF THE 



No. 36 



The Seasonal Pbevalence of Hypodebma bovis in 1915. — Continued. 



July. 



Sunshine. 



Hrs. Min. 



4.... 



5.... 



6.... 



7.... 



8.... 



9.... 

 10.... 

 11.... 

 12.... 

 13.... 

 14.... 

 15.... 

 16.... 

 17.... 

 18.... 

 19.... 

 20.... 

 21.... 

 22.... 

 23.... 

 24.... 

 25.... 

 26.... 

 27.... 

 28.... 

 29.... 

 30.... 

 31.... 



Aug. 



1.... 



2.... 



Piles seen, cattle running. 



Cattle quiet, no flies 



Plies seen, cattle running. 



Cattle quiet, no flies 



1 H. hovis taken 



Flies seen, cattle running. 



Cattle quiet, no flies. 



Flies seen, cattle running. 

 Cattle quiet, no flies 



Plies seen, cattle running. 



Cattle quiet, no flies 



Plies seen, cattle running. 

 Cattle quiet, no flies 



1 H. hovis taken 



Cattle quiet, no flies. 



Plies seen, cattle running. 

 Cattle quiet, no flies 



Cattle quiet, no flies. 



10 

 4 

 1 

 9 

 6 

 5 

 6 



48 

 42 

 42 

 18 

 6 

 48 

 00 

 86 

 30 



Rain. 



Temperature, 'F. 



Inch. 



Max. 



Min. 



2 



5 

 6 

 11 

 11 

 11 

 11 

 11 

 10 

 10 



Dull 

 Dull 

 DuU 



12 

 18 

 00 

 06 

 54 

 36 

 30 

 10 

 54 

 06 



.03 

 .18 

 .02 

 .25 



.04 

 .16 

 .08 

 .02 

 .58 



DuU 



36 

 80 

 42 

 80 

 00 



08 

 08 



.05 

 .02 



.08 



82 

 77 

 76 

 84 

 70 

 69 

 71 

 68 

 70 

 69 

 68 

 64 

 66 

 70 

 79 

 88 

 95 

 84 

 78 

 81 

 86 

 76 

 70 

 71 

 72 

 77 

 75 

 72 



78 

 76 



59 

 52 

 55 

 43 

 44 

 44 

 42 

 40 

 43 

 41 

 42 

 40 

 47 

 46 

 34 

 42 

 56 

 50 

 49 

 46 

 48 

 49 

 49 

 56 

 58 

 58 

 56 

 55 



52 

 50 



No more flies seen for the rest of the season, nor were the cattle seen running. 

 Seasonal Activity of H. bovis. at Agassiz. 



In 1912, H. hovis was first noticed on June 8tli, and the last appearance 

 was on Aug. 2nd, a total of 56 days. 



In 1914, H. hovis appeared on May 31st, and none were recorded after July 

 27th. On, this latter date, the flies were seen attacking the cattle at 6.30 p.m. 

 Total 57 days. 



In 1915, the flies were either seen or caught on 28 days, from June 5th 

 to July 30th, a total of 55 days. The height of the season was from June 20th 

 to July 11th. 



These observations coincide closely with the pupal period and with the time 

 the last larvffi emerge from the backs of cattle; both at Agassiz and in Europe. 



Emergence of Larv.e. 



Carpenter (1915) says that most of the maggots emerged from May 27th to 

 June 17th, "while a belated one occurred several weeks afterwards on July 3rd." 



In my own article (1912) I recorded the last larvas of the season on July 2nd. 



Lucet (1914) says, " Sur 79 que j'ai recueillies. 24 I'ont ete du 16 au 31 mai; 

 53 du ler au 30 juin : 2 au debut de juillet, epoque a laquelle mes sujets d'ex- 

 perience en furent debarrasses." 



