248 



EXPLANATION OF THE PLATES. 



/ 



PLATE X. (continued.) 



Fig. 

 9. 



10. 



Labium of Jpafhus cam- 

 pestris $ . 



The relative proportions 

 of the labium and labial 

 palpi of Bombus lapida- 

 rius. 



Fig. 



11. The relative proportions 



of the labium and labial 

 palpi of Bombus Der~ 



hamellus $ . 



i 







4 





I 



