made of the numlier of flowers which were visited and of 

 the nuDiher which were tripped by insects of different 

 kinds. The results of these ohservations are given in 



Tahle XVll. 



Table XVll. 



Showing percentage of alfalfa flowers tripped by 



different honey gathering insects. 



Percent 

 Total age 



number of Humber of 

 Where flowers of flowers flowers 

 Date Spec ies observed visit ed trij^p ed trip ped 



1909-Apis sp.-~ Pullma.n, Wash. ---318 ---1 0.31 



1910-Apis sp.-- Pullman, Wash. i8g--'.-----3 1.58 



1909-ApiB sp.- Chinook, Mont. 126- - 6 4.76 



1909-Boinbus spp-Havre ,Font . 268 ---79 29.40 



1909 -Megachile" -Pullman, Wash. 52 ---.47 90.38 



19 09:-Megachile" -Chinook, Mont. ,45 -----_ 42 93.33 



Table XVll shows that on 90 percent of the flowers 

 visited by the wild bees of the Megac hAle spy . were tripped. 

 The bumblebees which were observed were somewhat less 

 effieicnt than the Mega ch ile sj)£. , 29.4 percent of the 

 flowers visited bjr the bumblebees being tripped. Some of 

 the species of bumblebees appeared to be more efficient 

 than others in tripping jrhe flowers which they visited. 

 Domestic honeybees do not trip more than a small percent- 

 age of the flowers from which they gather honey. Prom the 



(45) 



