THE BKOAD-BEAN WEEVIL. 



11 



pending on the weather conditions, from one month to a possible 

 eight months. Table VII gives a summary of the life-history 

 records. 



Table VII. — Life history of the broad-bean weevil in California. 



Locality. 



Eggs 

 laid. 



Hatched. 



Dura- 

 tion of 



egg 

 stage. 



Pupated. 



Dura- 

 tion of 

 larva 

 stage. 



Adult. 



Dura- 

 tion of 

 pupa 

 stage. 



Died. 



Dura^ 

 lion of 

 adult 

 stage. 



Total 



length 



of 



life. 



Pasadona . 

 Hayward . 

 Hayward . 



Alhambra. 



1917. 

 May 3 

 May 11 



1917. 

 May 15 

 May 24 



Days. 

 12 

 13 



1917. 

 Aug. 19 

 Auj. 29 

 Sept. 3 



1918. 

 July 20 

 Aug. 5 

 Aug. 22 

 Aug. 5 



...do 



Aug. 22 

 Aug. 12 

 Sept. 10 

 Aug. 5 

 Aug. 30 



Days. 

 96 

 98 



"'"96" 

 80 

 94 

 97 

 106 

 04 

 87 



1917. 



Aug. 27 

 Sept. 8 

 Sept. 12 



1918. 

 Aug. 4 

 Aug. 21 

 Aug. 30 

 Aug. 12 



...do 



Aug. 30 

 Aug. 28 

 Sept. 17 

 Aug. 13 

 Sept. 13 



Days. 

 8 

 10 

 9 



10 

 16 



8 

 7 

 7 

 8 



16 

 7 

 8 



14 



Sept. 27,1917 

 Feb. 8, liUH 

 Dec. 7,1917 



Days. 

 31 



ir,2 

 86 



Days. 

 117 

 273 



1918. 

 Apr. 9 

 . ..do 



1918. 







Alhambra. 













Alhambra. 



...do 













Alhambra. 

 ALliambra. 

 Alhamlira. 

 Alhambra. 



Apr. 28 

 May C 

 May 7 

 Apr. 28 

 May 17 

 May 17 

 May 17 

 Mar. 14 



May 5 

 May 17 

 May 20 

 May 7 

 May 27 

 June 2 

 June 4 

 Mar. 28 



9 

 11 

 13 



9 

 10 

 16 

 18 

 14 



12.5 



Apr. 23,1919' 

 Dec. 26,1918 

 May 31,19191 



253 

 137 

 274 



359 

 235 

 393 



Alhambra. 









Alhambra. 

 Alhambra. 

 Alhambra. 



Dec. 6, 1918 

 Nov. 30, 1918 



114 



78 



203 

 197 







90 













Averages. . 



10 



140 



258 

















1 Theoretical, showing possible life history from two records. 



SEASONAL HISTORY. 



Egg laying begins about the middle of March, is heaviest in April, 

 and extends a little beyond the middle of May. The larval period 

 is from the latter part of March to the middle of October. Pupse 

 can be found from the first of August to the latter part of October, 

 and adults from the middle of August to about the following June. 

 Tables VIII and IX show the actual records of the seasonal history 

 for 1917 and 1918. 



Table VIII. — Seasonal history of Brnchus ruflmanus in Pasadena and Alhambra, 



Calif. 



Year. 



First 

 eggs 

 ob- 

 served. 



Last 



eggs 



ol> 



served. 



First 



eggs 



hatched. 



Last 



eggs 



hatched. 



First 

 full- 

 grown 

 larvee. 



Last 

 full- 

 grown 

 larvse. 



First 

 pupa. 



Last 

 pupa. 



First 

 adult. 



Last 

 adult. 



1917 



Mar. 23 

 Mar. 14 



May 20 

 May 19 







Aug. 1 

 July 16 



Oct. 19 

 Sept. 26 



Aug. 3 

 July 18 



Oct. 22 



Sept. 28 



Aug. 10 

 July 25 



C) 



lyis 



Mar. 28 



June 4 









1 About June 1, 1918. 



