NO. 120G. ICHNEUMON FLTES—A SHMEA 7). 53 



g(Miorii of a world-wide distribution, and among which are such con- 

 spicuous genera as RJiyssa and Tludessa^ coninionly known as the 

 Long- Stings. 



The species belonging to these two genera destroy the xylophagous 

 saw-flies l)elonging to the genera Sirex^ Paururus Tremex, etc., which 

 bore and live in the interior of various forest trees, and in order to 

 reacli their hosts their ovipositor has become enormously developed, 

 attaining sometimes the length of 5, 6, or more inches. Undoubtedl}^ 

 this group is closely allied to the Lissonotini^ and some authorities would 

 unite the two groups; but I agree with Forster in thinking the Plm- 

 flini distinct since they may l)e readily separated l)y the sculpture of 

 the abdomen, the transverse impressions or furrows on the segments 

 and particularly b}' the lateral impressed lines on segments 2 to 5, 

 which are never present in the Lissonotini. 



Sixty-one genera have been recognized in the group separable as 

 follows: 



TABLE OF GENERA. 



Mei^onotum not transversely rugose 4 



IMesoiKituia transversely rugose. 



Areolet in front wings present 2 



Areolet in front wings wanting. 



(334) Epirhyssd Cresaon= Rhyssonola Kriechbaumer. 

 (Type, Epirhyssa speciosa Cresson.) 



2. Metathorax not areolated; head without a carina between the antennaj 3 



Metathorax areolated; head sometimes iritJi a carina between the antenna\ 



Head wUh a strong carina l)etween tlieantennte; transverse median nervure 

 straight, not )>roken, the subdiscoidal nervure originating from the 

 median vein far beyond the apex of the submedian cell. 



(33.5) Apechneura Kriechbaumer. 

 (Type, Rhyssa terminalis Brull4.) 

 Head witltout a carina between the antennse. 



(336) Certonolus Kriechbaumer. 

 (Type, Certonotus varius Kriechbaumer.) 



3. Transverse median nervure in hind wings broken far above the middle, or the 



subdiscoidal nervure originates from the angle formed by tlie trans- 

 verse median and the median veins. 

 Head with the tem2)les broad, well developed, nearly the widtli of the eyes; 

 hind tarsi much elongated, very much longer than their til)ia'; abdo- 

 men in female compressed toward apex. 

 Clypeus anteriorly medially lengthened or unidentat(!; abdominal seg- 

 ments at apex either rounded or emarginate. 



(337) Jihyssa G raven horst. 

 (Type, Ichneumon jjersuasorius lAnnn'us.) 

 Clypeus anteriorly truncate; abdominal segments in male smooth, with 

 segments 3-7 at apex emarginate or deeply excavated. 



(338) Thalesm Holmgren. 



(Type, Ichneumon clarator Fabricius.) 



Head with the temples very narrow, scarcely half the width of the eye; 



hind tarsi normal, liardly longer than their tibije; abdomen depressed. 



(339) Lytarmes Cameron. 

 (Type, Li/t(trnirK m((culipennis Cameron.) 



