mediate and posterior pairs with the subtermiiial 

 spines very short. 



OBSERVATIONS. 



I first published an account of this species in 

 " Long's second Expedition," from a male spe- 

 cimen obtained near the Falls of Niagara on a 

 Hickory tree. I had previously found an indi- 

 vidual in Missouri, and recently on a journey 

 with Mr. Maclure, I found several specimens 

 on the sheltered face of a rock at Franklin, New 

 Jersey ; amongst these was the female which we 

 now make known. 



Since the above was written, Mr. Charles 

 Pickering, of Salem, Massachusetts, has inform- 

 ed me that he obtained an individual near that 

 city. 



The left figure of the plate represents the 

 male. 



The right hand figure, the female. 



PLATE 37. 



