DESCRIPTION. 



Head black, with the vertex, basal joint of the 

 antennae, anterior margin of the clypeus, and 

 base of the mandibles, dull rufous : thorax black, 

 anterior segment, and two spots before the scutel, 

 obsoletely dull rufous : scutel with a yellow line : 

 metathorax rufous each side and above: superior 

 wings tinged with purplish ; costal margin rufous 

 to the tip of the cellules : cubital cellules three, 

 the intermediate one petiolated, and receiving 

 two recurrent nervures: feet rufous: tergum 

 dusky rufous, with four transversely oval bright 

 yellow spots on each side, of which the anterior 

 one is very small, and the posterior one is nearly 

 extended into a band. 



OBSERVATIONS. 



Inhabits various parts of the Union, and is not 

 uncommon in Pennsylvania. The wing cells 

 are remarkable ; the intermediate cubital cellule 

 having two recurrent nervures. 



The lower figure. 



PLATE XXIX. 



