280 



E. GABRITSCHEVSKY. 



Standards and Color Nomenclature," 1912, Washington). The black parts are 

 again black in the flies and bumblebees; the striped individuals have on those 

 segments a cadmium orange coloration. The exact shades of these different red 

 tints are given under every figure in the explanation of the plate. 



EXPLANATION OF PLATE I (Nos. i-io). 

 The European and Asiatic Groups of Volucella Bombylans. 



1. Volucella Bombylans, 6, 9. 



2. Volucella Bombylans, var. rufa 9 . 



3. Volucella Bombylans, var. flava. 9. 



4. Volucella B. hcemoroidalis 6 . and Volucella B. altaica 9 . 



5. Volucella B. hcemoroidalis 9 . 



6. Volucella B. plumata 6 



7. Volucella B. plumata 9 . 



8. Volucella caucasica 6 . 



9. Volucella altaica 6 . 



10. Volucella plumata var. a 9 . 



The yellow pile is variable. Specimens of these flies are found with a maize 

 yellow (19-40, y. /., PI. IV.), wax yellow (21, o-yy PI. XVI.), and deep colonial buff 

 yellow (21, o, PI. XXX.). The red pile is less variable, yet specimens with a 

 cadmium orange (13, o-o, PI. III.), or Mars yellow (15-00, PI. III.), or ochraceus 

 tawny (15-00, PI. XV.) are found. 



The white pile is snow white, or with a slight yellow tint. 



EXPLANATION OF PLATE I. (Nos. 11-27). 

 The North American Group of Volucella bombylans. 



11. Volucella bombylans facialis lateralis, 6. 9 . 1 ,, 



The facialis group maize 



12. V. B. facialis, 6.9- 



yellow. 



13. V. B. facialis var. rufomaculata, 6.9. 



14. V. B. evecta, 6.9. 



15. V. B. evecta-americana, 6 . 9 . 



16. V. B. evecta var. sanguinea, 9 



17. V. B. evecta artica, 6.9. 



The evecta 

 yellow. 



group maize 



The North American Bumblebee-like Syphida 11-27. 

 The yellow pile is maize yellow (19-40, y. /., PI. IV.), the red pile is cadmium 



orange (130-0 PI. III.). 



18. Mallota poslicata, 6.9. 



19. Mallota posticata var. a, 6 , 9 . 



20. M. cimbiciformis var. a, 6 . 9 . 



21. M. cimbiciformis var. b, 6 . 9 . 



22. M. cimbiciformis var. c, 6 . 9 . 



23. Erislalis flavipes var. a, 6 . 9 



24. Er. flavipes var. b, 6 . 9 



25. Er. flavipes var. melanostoma, 9 



26. Er. baslardii, 9 . 



27. Er. bastardii, 6 . 9 



!> Wax yellow or maize yellow. 

 \ Gray pile. 

 Wax yellow pile. 



Wax yellow or maize yellow. 



> Maize yellow. 



