HYMENOPTERA. 99 
The larva of another species, the O. moderator, Fab., destroys 
that of another Ichneumon, the Pimpla strobilellz, Fab.(1) 
Bancuus, Fab. 
Similar as to the antennz, but the abdomen of the females is nar- 
rowed at the end and terminated in a point(2). 
HELWIGIA. 
The port of the preceding Insects, but the antenne thicker near 
the extremity(3). 
Sometimes the abdomen is rather fattened than compressed, being 
either somewhat oval, or almost cylindrical, or fusiform. 
In these, the abdomen is considerably narrowed at base in the 
manner of a pedicle. 
Joppa, Fab. 
The Joppz are removed from the following subgenera by their 
antenne, which are widened or thickened anterior to the extremity, 
and then terminate in a point(4). 
IcHNEUMON proper. 
Where the head is transversal and the abdomen somewhat oval, 
and almost equally narrowed at both ends. 
Panzer has separated generically, under the name of 7rogus, those 
species in which the scutellum forms a conical tubercle, and the 
abdomen presents deep transversal incisures(5). 
Atomya, Fab. 
Where the head is narrower and more rounded, with the abdo- 
men more widened near its posterior extremity. 
An Ichneumon inhabiting France, and which appears to us 
nearly allied to the femoralis of Gravenhorst—Ichn. Pedem., 
=~ 
(1) Fab., Syst. Piez.; and Encyc. Méthod., article Ophion. 
(2) Fab., Ibid. 
(S) See the Bullet. Univers. des Sc. of Baron Férussac. 
(4) Fab., Syst. Piez. 
(5) Fab., Ibid., and Panz. Hymenopt. 
