North American Hymen oyi era. 



395 



thorax with the including line of the posterior dlsk^ 

 prominent only towards the petiole : iergum darker pur- 

 plish than the thorax ; the broad posterior margins of the 

 segments, blackish : feety purplish and blue : tarsi black- 

 ish-piceous. 



Length about two fifths of an inch. 



About the size of the preceding, from which it differs 

 materially in color, and in the sculpture of the meta- 

 thorax. , 



4. H. piirus. Green; first recurrent nervure confluent 

 with the dividing nervure of the second and third cubital 

 cellules. 



Inhab, United States. 



9 Body green, polished, tinged with brassy or cupre- 

 ous : anteniKB black : lahrum and mandibles picedus, the 

 latter sometimes almost honey-yellow : metathorax at 

 \>2Lse lineated ; no distinct posterior disk, but the groove 

 is well impressed; and there are often near the petiole, a 

 fewj obsolete^ raised^ converging lines : wings hyaline, 

 very slightly dusky at tip ; nervures browa ; radial ner- 

 vure fuscous ; stigma pale yellowish ; second recurrent 

 nervure exactly uniting with the tip of the dividing ner- 

 vure of the second and third cellules : tergum obviously 

 varied with brassy ; posterior slender margins of the 

 segments dark purplish or blackish, sometimes not obvi- 

 ous : feet dull piceous : venter dull piceous. 



Length less than three tenths of an inch. 



^ Head, thorax and metathorax, greenish-blue : man- 

 dibles and lahrum, dull honey-yellow : thighs obviously 

 tinged with bluish-green: venter on the middle segments 

 green. 



'o 



fou 



-1 



A very common species. I have found their nests in 



->. 



