THE SPHEGIDjE. 



459 



streaks of steely blue, each streak having a narrow edge of 

 purple. 



Fig. L>39.— Pepsis nigrescens, (New species. ) 

 (Black ; wings streaked with blue and purple.) 



With this insect we end the Pompilidse, and now proceed to 

 the next group. 



The Sphegidse are at once known by the shape of the abdomen. 

 This is attached to the thorax by a long footstalk, composed 

 of the first segment of the abdomen greatly elongated, just 



Fig. 240. — Ammopliilu nielanaiia. 

 (Black.) 



as a thin wire is drawn from a thick bar. Sometimes a portion 

 of the second segment is included in the footstalk. 



Some species have this footstalk wonderfully elongated, 



