24 



BRITISH ICHNEUMONS. 



[Rhj'ssa. 



(6). I. 



Table of Genera. 



Large species or central segments 

 elongate ; terebra longer than 

 body. 



Mesonotum transversely rugulose . . 



Mesonotum not transversely sculp- 

 tured. 



Abdomen punctate ; thorax black ; 

 onjxhes of 9 basally lobate 



Abdomen glabrous ; thorax red ; 

 onyches not lobate . . 



Smaller species or central segments 

 rarely elongate ; terebra shorter. 



Abdomen glabi^ous and nitidulous ; 

 body mainly flavous 



Abdomen usually coarsely punctate 

 and body black. 



Hypopygium not reaching base of 

 terebra ; areolet usually entire. 



Clypeus basally discreted through- 

 out ; femora normal. 



Areolet entire ; ctypeus deeply im- 

 pressed before apex 



Areolet wanting ; clypeus not im- 

 pressed before apex. 



Mesonotum not cristulate ; abdomi- 

 nal tubercles strong 



Mesonotum cristulate ; abdominal 

 tubercles weak 



Clypeus not basally discreted ; 

 femora stout 



Hypopygium reaching terebra but 

 not anus ; areolet wanting. 



Central segments not obliquely im- 

 pressed throughout. 



Front femora emarginate beneath ; 

 terebra subexseited 



Front femora entire ; terebra dis- 

 tinctly exserted 



Central segments obliquely impressed 

 throughout. 



Scutellum quadrate, apically ti"un- 

 cate and laterally pale 



Scutellum normal and apically 

 rounded 



Rhvs.sa, Grav. 



Ephialtes, Schr. 

 Perithous, Holnigr. 



Theronia, Hulmgr. 



PniPLA, Fah. 

 POLYSPHINCTA, Grav . 



ACROUACTYLA, Hal. 



SCHIZOPYGA, Grav. 



COLPOMERIA, Hohngr. 

 Clistopyga, Grav. 



Lycorina, Holmgr. 

 Glypta, Grav. 



RHYSSA, Gravenhorst. 

 Gr. I. E. iii (1829), 260. 



A genus of very large and strongly elongate species, with trans-striate 

 mesonotum and terebra longer than the body. Head short, subbuccate 

 and transverse, usually dilated behind the oval or subreniform eyes ; clypeus 

 very short, strongly transverse and generally a little produced centrally at 

 the apex, often indistinctly discreted basally ; mandibles basally broad. 

 Antennae filiform, not attenuate apically, with the flagellar joints elongate. 

 Thorax subcylindricid, discally deplanate ; pronotum centrally glabrous ; 



