North American Hymenoptera. 247 



process and a small white spot ; second recurrent nerv- 

 ure much undulated, margined v^iih white one half its 

 length ; exterior nervure of the cellule with a white 

 spot : feet^ anterior pairs, excepting the cox32 and tro- 

 chanters, honey-yellow ; posterior pair black, tlieir tarsi 



yellow. 



Length at least half an inch, 



2. B, cequatus. Black ; antenuce and feet, excepting 

 the hinder thighs, yellow. 



Inhabits Indiana. 



Body black: antennce yellow, at tip and base a little 

 dusky : hypostoma with two slight lobes situated longi- 

 tudinally, and with the mouth and orbits yellow : thorax 

 with a slightly indented line each side before and another 

 over the wings : wings violaceo-fuliginous j nervures and 

 stigma blackish, the latter with a whitish dot at its stric- 

 ture ; second cubital cellule pentangular, the two angles 

 on the costal side rectangular and the three correspond- 

 ing sides equal, the two anal sides shorter and equal, two 

 sides with a white spot and the two recurrent nervures 

 with each a white spot : wing-scale and junction of the 

 wings with the thorax honey-yellow : feet^ anterior pairs 

 honey-yellow ; posterior pair wuth the tibiae and tarsi 



yellow. 



Length about half an inch. 



It has much resemblance to Agathis politaj Nob- 



3. B- fugitlvus. Second cubital cellule petiolated; 



posterior tibiae annulate. 



Inhabits Indiana. 



Body black : antenncB in both sexes black : mandibles 



and palpi white : wing'Scale white : wings hyaline ; 



nervures black, whitish at base ; second cubital cellule 



very small, petiolated from the radial cellule : metathorax 



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