North American Hymenoptera. '289 



\vith an acute, longitudinal, elevated line over the inser- 

 tion of each antenna and a slight! j impressed line in the 

 middle ; antenncE and mandibles piceous : thorax honey- 

 yellow, dusky before : wings tinged v ith fuliginous ; 

 nervures dusky and very distinct ; recurrent nervure 

 forming a quadrate cellule less than half the size of the 

 first cubital ; anal nervure abruptly angulated near the 

 anal emargination of the edge, and almost dislocated in 

 that part, the terminal portion being arcuated at each ex- 

 tremity: scale thick, prominent, obtuse, entire: abdomen 

 blackish, with prostrate hairs, and sparse elevated ones 

 and regular ciliae on the ed<ies of the sef^^ments ; first seir- 



ment honey-yellowish at base, without any indentation 

 opposite the scale : feet honey-yellow. 



* 



J Trunk and scale entirely pale honey-yellowish : 

 scapus of the antennae, hypostoma anc^ mouth pale yel- 

 lowish : abdomen somewhat piceous. 



Length three tenths, J less than two fifths of an inch. 



Not uncommon in the forest, running rapidly upon the 

 branches and leaves of bushes. 



7. F. subsericea. Black, minutely sericeous ; abdo- 

 men impunctured. 



Inhabits Indiana. 



Body impunctured, black, very minutely sericeous : 

 thorax with an impressed line before : wings dusky ; dis- 

 coidal cellule about half as large as the first cubital, a 

 little narrower before : scale obtuse, or widely rounded 

 at tip, somewhat truncate. 



Length ^ less than two fifths, ? over two fifths of an 

 inch. 



My specimen of the female has the legs entirely black ; 

 and of two males one has the legs honey-yellow, with the 

 exception only of the base of the coxse ; and the other 



VOL. I. PART III. 38 



