144 Cameron, Hymenoptera Orientalia. 



Lytarmes, gen. nov. 



Mesonotum transversely striated, trilobate, the middle 

 lobe only distinct in front Clypeus separated from the 

 face, its sides at the base depressed. Mandibles short, 

 thick, bidentate at the apex. The head not much dilated 

 behind the eyes. Areolet appendiculate, the appendicle 

 as long as, or shorter than, the cellule itself ; the latter is 

 rounded at the top. The transverse median nervure is 

 received in front of the transverse basal. The recurrent 

 nervure is received near the base of the areolet. The 

 radial cellule elongate, lanceolate at the base and apex. 

 Scutellum flat; the median segment has a gradual slope 

 to the apex ; the spiracles are large, elongate, rounded at 

 the base and apex. Abdomen without depressions, 

 smooth; the petiole shorter than the second segment; the 

 spiracles are oval, oblique, and are placed near the 

 base. Legs stout ; the hinder coxse large, of equal width, 

 not swollen; the tarsi spinose; the claws simple; the 

 hinder tibise and tarsi subequal. The intermediate abdo- 

 minal segments are not longer than their breadth ; the 

 segments are aciculate and not emarginate or grooved at 

 the apex; in the $ they are convex above. The meta- 

 is shorter than the meso-thorax. The last joint of the hinder 

 tarsi is about three times as long as the penultimate. 



The first recurrent nervure is received shortly before 

 the middle of the cellule; there is a short nervure on the 

 cubital nervure, before the areolet, as in Ichneumon. Except 

 in the form of the abdomen the $ does not differ from the ?. 



This genus has the striated mesonotum oi Rhyssa^hvit 

 differs from it in the appendiculated areolet and in the 

 abdominal segments being not distinctly longer than their 

 breadth, in the shorter hinder tarsi compared with the 

 tibiae, in the much shorter hinder coxae, and in the head 

 being less developed behind the eyes. 



