THE SPHEGID^. 



459 



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

 purple. 



FiG. 239.— Pepsis uigirscens. (New specit-s. ) 

 (Black ; wings streaked with lilue and purple.) 



With this insect we end tlie Pompilidad, and now proceed to 

 the next group. 



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

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

 of the first segment of the abdomen greatly elongated, just 



Fig 240 — Ainnioplnla nielanai 

 (lUvk) 



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, 



