North American Hymenoptera. 305 



;palpi whitish : wings hyahne ; third cubital cellule very 

 little contracted before^ larger than the second j first re- 



nervure 



honey-yellow, the coxae only black. 

 Length over two fifths of an inch. 



/^ 



8. P. (]\Escus) comicus. Black ; wings a little dus- 

 ky; basal line of transverse nervures widely dislocated 

 by the externo-medial nervure. 



Inhabits Indiana. . ' 



9 Body black, immaculate : wings dusky ; nervures 

 blackish ; second cubital cellule somew^iat conic, the 

 anterior basal nervure entering the radial cellule in a 

 much arcuated dh^ectioU; so as not to form an angle with 

 it ; third cubital cellule not much contracted anteriorly ; 

 basal series of transverse nervures widely dislocated, that 

 portion which is between the externo-medial and anal 

 nervures is equal to the length of the dislocation ; abdo- 

 men polished : mandibles at tip piceous- 



Length less than one fifth of an inch. 



^ Wings less obscure : anterior tibiae and tarsi obso- 

 letely dull yellowish. 



Length one fourth of an inch. 



9. P. (jyEscus) petiolatus. Tergum fulvous near the 

 base ; third cubital cellule petiolated. 



Inhabits Indiana. 



9 Body black, a little sericeous : wings blackish ; 

 third cubital cellule decidedly petiolated: tergum with 

 the terminal half of the first segment, and the greater 

 portion of the second segment yellowish-fulvous. 



Length over two fifths of an inch. 



The petiolated character of the third cubital cellule 

 resembles that of the P. niger, Fabr- The basal series 



transverse 



[To be continued.] 



VOL. I. PART III. 40 



