PARASITICA — ICIIN KUMONIDii:. 39 



(excepting in the genus Pliarxa/i<i of the Ophionina") luul therefore 

 there are two recurrent nervures, the first of whicii is r(>ceived by 

 the cubito-discoidal cell, which rarely receives Ix-th as in Ophion, 

 Thyreodon, Nototrachys and Arotex; the ccjstal cell is absent by reason 

 of the confluence of the costal and subcostal nervures (a) ; the stigma 

 (n) is usually well developed, sometimes very large, rarely subob- 

 solete. 



The head is generally ti-ansverse, scarcely wider than the thorax, 

 sometimes subquadrate when the cheeks are inflated, i-arely globose ; 

 the face is usually flat or feeljly convex, sometimes prominently con- 

 vex as in Orihocentru-i, Exoehus, etc., very rarely scutatiforni as in 

 3fetopim; clypeus depressed or convex, seldom nasutifoi-m as in 

 Grypocentrus, often without line of separation from the face as is 

 frequently the case in the Ophionins« ; the eyes are more or less 

 prominent and lateral, sometimes subemarginate within ojiposite the 

 insertion of the antennae ; ocelli generally small and arranged in a 

 curve or triangle, rarely lai-ge and prominent as in Ophioii, Epimecis, 

 etc. ; the antennae seldom exceed the body in length, usually slender 

 and filiform, rarely dilated as in Joppidium and Euceros, or some of 

 the joints emarginate as in Cylloceria ; they are never elbowed, the 

 basal joint mostly short, ovate or globose, and the second joint small 

 and annular. 



The })rothorax, or collar, is generally short and inconspicuous 

 when viewed from above, but laterally extending to the teguke ; 

 mesothorax smooth or punctured, rarely transversely ridged as in 

 Rhyssa, etc. ; scutelkun usually flattened or convex, rarely pyramidal 

 as in Trogus, or spined as in Banchus, and often of a ditterent coloi- 

 from the rest of the thorax; metathorax generally areolated, raicly 

 bispinose as in HopUsmemis, Hemifefes, Mesostenu.%, etc . 



The legs are usually long and slender, the posterior femora seldom 

 toothed beneath as in Odoiitoiiient.-^, Frlstomeni,'^ and Eip/iosoma ; 

 sometimes the tibiiB are inflated or twisted as in Xylonomiis and allied 

 genera. 



The abdomen is generally elongate-ovate, or cylindrical or subfu- 

 siform, pedunculate and often sessile, or compressed and sickliK^haped 

 as in the Ophioninae, and always attached to the apex of the meta- 

 thorax ; the ovipositor varies much in length, often short, or not ex- 

 serted, or very long as in Rhy>^x<i and many of the rimi)lina3, the 

 ventral valve rarely large, long and lanceolate as in Coleocentrus and 

 allied genera. 



