286 E. GABRITSCHEVSKY. 



EXPLANATION OF PLATE IV. 

 Bumblebees of the Rocky Mountains. 



1. B. hunlii, 9, 8, 6. (Olive ochre, 21" PI. XXX.) 



2. B. huntii, ,, 6 . (Amber yellow, 21" PI. XVI.) 



(3d and 4th abd. segments cadmium orange, 130 PI. III.) 



3. B. melanopygus, 9. (Cartridge buff 19" PI. XXX.) 



(3d and 4th abd. segments cadmium orange 130 PI. III.) 



4. B. melanopygus, $ . (Segments cadmium orange PI. III.) 



5. B. sylvicola, 9, 8, 6- (Straw yellow, 21' PI. XVI.) 



(3d and 4th abd. segments orange rufous, n', i PI. II.) 



6. B. lernarius, 9, 8, 6- (Straw yellow, 21' PI. XVI.) 



(3d, 4th and 5th abd. segments cadmium orange PI. III.) 

 (130 light buff, 17' PI. XV.) 



7. B. flavifrons, 9,8. (Thorax light buff, 17', o PI. XV.) 



(Abdomen ochraceus tawny, 15 PI. XV.) 



8. B. flavifrons, 6- (Antimony yellow, 17', b PL XV.) 



9. B. rufocinctus, 9, 8. (Thorax, colonial buff, abdomen olive ochre, 21" 

 PI. XXX.) 



10. B. rufocinctus, 6 (Colonial buff.) 



11. B. rufocinctus, . (Colonial buff.) 



12. B. apositus, 9 . 8 , 6 (Thorax white with gray.) 

 B. borealis, 9 . 



13. B. edwardsii, 9 , 8 . (Maize yellow, 19 PI. IV.) 

 14-15. B. edwardsii, 6 . (Maize yellow PI. IV.) 



16. B. edwardsii, 6 (Cadmium orange, 13 PI. III.) 



17. B. edwardsii, . (Cadmium orange, 13 PI. III.) 



1 8. B. centralis, 9,8. (Maize yellow, 19 PI..) 

 (Cadmium orange, 13 PI. II.) 



EXPLANATION OF PLATE IV. 



The Arctic Species of Bumblebees (Labrador). 



1. B. gelidus, 9,8. 



2. B. frigidus, 9,8. 



The Wax Yellow Group of Rocky Mountain Bumblebees. 



3. B. sonorus, 9, 8. (Wax yellow, 21' PI. XVI.) 



4. B. morrissoni, 9, 8. (Wax yellow PI. XVI.) 



5. B. nevadensis, 9,8. (Antimony yellow, 17' PI. XV.) 



EXPLANATION OF PLATE IV. 



Bumblebees of the Pacific Coast (California- Alaska). 



6. B. -voznosenskii, 9, 8, 6- (Pinard yellow, 21' PI. IV.) 



7. B. crotshii, 9. 8, 6- (Deep colonial buff, 21' PL XXX.) 



(4th, 7th segments flame scarlet PL II.) 



8. B. californicus, 9. (Chartreuse yellow, 25" PL XXX.) 



9. B. californicus, 9 . (Chartreuse yellow PL XXX.) 



10. B. californicus, 6- (Yellow ochre, 17' PL XV.) 



11. B. californicus, $. (Yellow ochre PL XXX.) 



