Fabricius, and by Latreille, in his earlier works, 



in MONEDULA. 



Of all the genera which form the order Hy- 

 MENOPTERA, the present genus is the most closely 

 allied to those of Monedula and Bembex, in 

 the general appearance of the insects of which it 

 is composed, as well as in the distribution of the 

 nervures of their wings. This affinity is so 

 striking in many species of these groups, that it 

 becomes necessary to inspect the form of the 

 labrum, in order to decide upon their respective 

 appropriate genus. A very remarkable difference 

 is observable in this organ, which, in those 

 genera, is much elongated and triangular, but in 

 Stizus it is short and semiorbicular. Nearly all 

 the species have three spines at the extremity of 

 the abdomen, as in the genus Scolia, but they 

 cannot be considered as Scoliae, as their eyes are 

 entire, and the form and number of the wing 

 cellules are altogether different. 



plate II. 



