332 APPENDIX. 



2. T, interrupta. Black, stethidium with yellow spots; 

 tergum with yellow spots and bands. 



Inhabits Pennsylvania. 



Jintennx dull black-brown, first joint polished, piceous 

 at tip ; mandibles piceous, black at tip; thorax with a spot 

 each side before, three in a line between the origin of the 

 superior wings, yellow ; scutel with a yellow, transverse 

 line; wiiigs hyaline, costal margin fuliginous ; metathorax 

 at the tip each side with a double, longitudinal, yellow spot; 

 pleura with a vertical, yellow, oblong spot beneath the ori- 

 gin of the superior wing; tarsi pale piceous; tibiae, ante- 

 rior pair blackish-piceous, posterior pairs pale piceous; 

 thighs black; tergum a little iridescent ; first segment with 

 a band abruptly and widely narrowed above ; second seg- 

 ment with an oval spot each side ; third segment, band 

 gradually narrowed in the middle ; fourth and fifth seg- 

 ments, bands slightly interrupted ; venter immaculate. 



Length nine-twentieths of an inch. 



In the collection of Mr. William W. Wood. 



This species would seem to be allied to the serena, 

 judging by the description that Fabricius gives of that in- 

 sect, particularly as he describes the costal margin of the 

 wings to be fuscous. That insect, however, is stated to be 

 only a little smaller than the namea of the same author, a 

 size which at once puts that species out of the question. 



POMPILUS, Fab. Lair. 



1. V.fascipcnnis. Black; wings hyaline,'with a fuscous 

 band near the tip ; abdomen rufous at base. 

 Inhabits United States. 

 9 Hypostoma. and inferior portion of tlie front, with 



