EXPLANATION OF THE PLATES. XXV 



11. Coccinella punctata. 



12. Coccinella instabilis, 



13. Pemphredon unicolor. 



14. Colax dispar. 



15. Tropoxylon clavicerum. 



The genera, Nos. 1,2, 13, and 15, deposit the Aphides in the 

 cells with their eggs, to feed their larvae when they are hatched. 



It is probable that many more of the fossorial Hymenoptera 

 furnish their cells with Aphides, as food for their young; and the 

 insects figured are rather to illustrate the genera that prey upon 

 Aphides, than the species that specially destroy the vastator. 



Nos. 3 and 4 deposit their eggs in the Aphides. 



Nos. 5, 7, 10, 11, and 12, feed upon the Aphides. 



No. 15 is parasitic upon some of the parasites of Aphides. 



