\ 



E, 



North America7i Hymenoptera. 

 Short lines of the thorax obsolete. 



229 



Var. 



A very common species. 1 liave taken it in Missouri, 



r 



Indiana; Pennsylvania and N. W. Territory. 



7. I. comptus. Black ; tergum with a yellow band 

 on each segment. 



Inhabits United States. 



m ' 



Body black : head w itli yellow bypostoma, orbits and 

 cheeks : thorax with a line before the wings, two slender 

 parallel lines, nearly as long as the disk, on the middle, 

 wing-scale, and often a short line between the wing and 

 scutel, yellow : sciiiel yellow ; wings tinged with fuli- 

 ginous ; second cubital cellule pentagonal, the anterior 

 recurrent nervure with a short process near the middle : 

 metathorax with a short transverse line at tip of the scutel 

 and two dilated longitudinal spots, yellow : tergum with 

 a dilated yellow band on each of the segments, the 2d 

 and 3d widest : feet yellow, or honey-yellow. 



5 with a whitish annulation rather beyond the middle 

 line of the antennse. 



L 



Length half an inch. 



Resembles the preceding, but differs jn many charac- 

 ters, as the two descriptions will prove. 



8. I. navus. Black ; orbits, line before the wings and 

 lateral margin of the scutel, yellow. 



Inhabits United States. 



9 Body greenish-black ; head with narrow yellow 

 orbits : palpi dull yellowish : thorax w^ith a slender line 



before the wings yellow : wings a little fuliginous ; 

 nervures fiiscous : scutel with a yellow lateral margin : 

 metathorax with a hne beneath the scutel generally in- 

 terrupted into two distant dots : thighs at base and tip, 

 tibia at tip, and tarsz^ with a slight tinge of piceous : 

 anteuTUB annulate. 



