340 APPENDIX. 



first submarginal cellule receives the two recurrent ner- 

 vures; nervures dark fuscous ; stigma rather large. 

 Length less than three-tenths of an inch. 



STIGMUS, Jur. Latr. 



^. fraternus. Black, antennae and feet yellowish. 



Inhabits Pennsylvania. 



Body deep black, polished, not obviously punctured ; 

 mandibles and palpi whitish : wings hyaline, nervures 

 pale brown, stigma piceous-black, whitish at base ; origin 

 of the wings yellowish ; pleura with a white spot rather 

 before the origin of the wings ; feet immaculate ; venter 

 whitish at tip. 



Length rather more than three-twentieths of an inch. 



This species is in the collection of Mr. William W. 

 Wood. It is closely allied to the ater of authors, the pe- 

 tiole of the abdomen, however, is proportionably longer. 



CRABRO, Fabr. Latr. 



1. C. tibialis. Black, polished ; thoracic line, scutel, knees, 

 and tibiae, yellow ; abdomen with piceous incisures. 



Inhabits Pennsylvania. 



9 Head with a slightly impressed frontal line, extend- 

 ing to the stemmata ; antennx, basal joint yellow ; hypos- 

 toma silvery, brilliant ; thorax with a transverse, yellow 

 line on the collar, not extending to the postpectus ; scutel 

 yellow; wings hyaline; nervures fuscous, those of the 

 disk pale at base ; metathorax slightly carinated each side 

 with a longitudinal, impressed line, which is a little dilated 

 beyond the middle, and a slight transverse line on the mid- 



