654 



THE STUDY OF INSECTS. 



Family NYSSONID^E (Nys-son'i-dae). 

 The Nyssonids (Nys-so 1 nids). 



These digger-wasps are of medium size. Some of them 

 are remarkable for their close resemblance In form and mark- 

 ings to true wasps of the family Eumenidae ; but they do not 

 plait their wings like the true wasps. Little is recorded re- 

 garding their habits ; some species provision their nests with 

 nymphs of leaf-hoppers, others with spittle-insects (Homop- 

 tera). It is said that the species of the typical genus Nysson 

 (Nys'son) have the habit of feigning death and dropping to 

 the ground when alarmed. 



We have about fifty species of this family in our fauna. 



Family PHILANTHID^E (Phi-lan'thi-dae). 



The Philanthids (Phi-Ian 1 thids). 



These digger-wasps are easily recognized by the charac- 

 ters given in the table above. Figure 779 represents the wing 



FIG. 779. Wings of Cerceris. 



of Cerceris (Cer-ce'ris) and shows the typical venation. The 

 males are peculiar in having a fringe of hairs resembling a 

 mustache on the free edge of the clypeus on each side. 



The Philanthids burrow in the earth. Some provision 

 their nests with bees; others with beetles. The family con- 

 tains about seventy-five North American species. 



