136 



Obsertatiom, 



Kirby's American Xenos differs generically from Stylops 

 in having the branches of its antennee nearly rounded and 

 without joints, and in having the last joint of its tarsi 

 (which are likewise four-jointed) entire. 



Since writing the above, I have received from my friend 

 Clairville, a paper by Jurine on the Xenos Vesparum of 

 Rossi ; from which it would appear that this insect like- 

 wise is referable to a very different genus from the American 

 Xenos. The abdomen of Jurine's insect is pedunculated ; 

 the processes attached to the anterior segment of the thq- 

 rax are elongate ; the wing-bones are differently disposed ; 

 and, what is of still greater importance, the tarsi are de- 

 scribed to be composed of five joints. 



Jurine's figure is very badly executed, the two sides 

 being dissimilar ; but from his description I have little 

 doubt that a third genus will soon be determined to belong 

 to this order. 



