368 



>/ 



B 



anteuTKs, basal joint yellowish : nasus and mouth, except- 

 ing the tip of the mandibles, pale yellow: thorax, poste- 

 rior margin of the collar, abbreviated line over the wings, 

 and wing-scalcj yellow : scutel yellow : wings dusky, 

 purplish-fuliginous, tinged with yellowish towards the 

 base; stigma small; second cubital cellule obviously 

 hexagonal : metathorax with two large, oblong-oval, yellow 

 spots; triangle at base, destitute of small lines and with 

 but a single impressed line : (ergum, basal segment yellow ; 

 posterior narrow margin, and lobed spot on the disk com- 

 municating with the base, black ; second segment yellow 

 on the posterior margin, the yellow rather dull and a 

 little undulated on its inner edge : third and fourth seg- 

 ments w^ith obsolete yellowish posterior margins : pleura 

 somewhat silvery sericeous, with three almost confluent 

 yellow spots in a line with the collar : feet pale, honey- 

 yellow ; thighs and coxce, with more or . less of black 

 above. 



Length about half an inch. 



This is a large spepies. The character which Jurine 



mentions as common to all the species, of having behind 



' the scutel a triangular space, in which parallel lines are 



sculptured, is so modified in this species as to present the 



triangle with only a simple longitudinal impressed line. 



Nysson, Latr. 



N. aurinotus. 



tergum 



with three lateral spots. 

 Inhab, Indiana. 

 Body black, punctured : head before with a slight 



pjceous 



collar 



A 



