248 EXPLANATION OF THE PLATES. 



PLATE X. (continued.) 



Fig. 



9. Labium of Apathus cam- 

 pestris J . 



10. The relative proportions 

 of the labium and labial 

 palpi of Bombus lapida- 



Fig. 



11. The relative proportions 

 of the labium and labial 

 palpi of Bombus Der- 

 hamellus $ . 



