Descriptions of new species of Hymcnoptera. 81 



2. P. obtusus. Black; feet whitish, thighs black in the 

 middle. 



Inhab. Indiana. 



Body black, polished; antennae fuscous; anterior 

 wings wide and very obtuse, finely ciliated, ciliae very 

 short; feet whitish; thighs black, white at base and tip; 

 coxre black. 



Length nearly one-twentieth of an inch. 



PLATYGASTER. Latr. 

 P. pallipes. Body black; antennae fuscous, monili- 

 form; basal joint honey-yellow; wings hyaline; abdo- 

 men polished, much depressed; widest near the tip and 

 obtuse, gradually and rectilinearly a little narrowed to 

 the base; feet whitish-yellow. 

 " Length one-thirtieth of an inch. 



'6' 



BETHYLUS. Latr. 



B. armifems. Black; tcrgum with elongated white 

 hairs. 



Inhab. Indiana. 



Body entirely black, immaculate, with short hairs; 

 head covered with discoidal punctures; lergum polish- 

 ed, with a few elongated, rigid, white hairs, ;is long as 

 two of the segments taken together. 



Length seven-twentieths of an inch. 



DRYINUS. Latr. 



1). bifasciatus. Yellowish; wings bifasciate. 



Inhab. Indiana. 



Body honey-yellow, varied with blackish; anterior 

 thighs dilated; wings with two fuscous bands, the api- 

 cial one broader. 



Length rather more than one fifth of an inch. 



