PARASITIC HYMENOPTERA. 209 



FF. Os patulum. 



Sp. 13. O. instabilis. Niger, antennarum basi ore pedibus- 

 qiie testacels, metathorace Icevi nitido ; fem. coxis posticis basi 

 fuscis, terebra \ abdominis longitudine. (Long. 1 lin.) 



O. instabilis. Wesm. Monogr. 126. No. 9. 



Obs. — In nostris abdominis segmentum 2 medio Iseve nitens : alae 

 albido-hyalinae : nervus recurrens in areolam cubitalem 2 longe 

 evectus : tarsorum articulus unguicularis feminis incrassatus. 



Habitat Hiberniam borealem in neraoribus at infrequens. 



Sp. 14. O. crassipes. Niger, mandibidis pedibiisque crassis 

 testaceis, coxis trochanteribus femorumque margine supero et 

 infero nigris, stigmate elUptico ; fem. terebra \ abdominis 

 longitudine. (Long. 1 lin.) 



O. crassipes. Wesm. Monogr. 127. No. 10. 



Habitat in Hibernia boreali semel atque iterum lectus. 



Sp. 15. O. saevus. Niger, antennarum scapo ore pedibusque 

 testaceis, nervo recurrente subinterstitiali, metathorace rugu- 

 loso; fem. terebra \ abdominis longitudine. (Long. corp. 1| ; 

 alar. Sg lin.) 



0. instabili major, antennae longiores, alse multo ampliores, areola 

 radialis longior, nervi recurrentis insertio fere interstitialis : an- 

 tennae corpore longiores, articulis mas 34, fem. 29, duobus 

 interioribus testaceis : clypeus et mandibulee testaceae, hae basi 

 non excisae : metathorax abdominisque segmentum 1 rugulosi, 

 hoc validum basi bicarinatum : alse hyalinse, squamulis testaceis, 

 nervis et stigmate fuscis : stigma tenuissimum lineari lanceolatum, 

 cubitum in triente prima excipiens : areola radialis in apicem alae 

 eftusa, cubitalis 2 sat longa, apice parum attenuata, nervus recur- 

 rens in alis posticis manifestus. 



Habitat per Ebudes insulas mas et femina lecti Augusto mense, — 

 feminum Damnoniensem misit F. Walker. 



Sp. 16. O. celsus. Niger, antennarum scapo ore pedibusque 

 testaceis, metathorace ruguloso, areola cubitali 2 elongata wqui- 

 lata, mas. (Long. 1 — 1\ lin.) 



Antennae corpore longiores, 33 — 36-articulatce : alse amplae glauco- 

 hyalinae, squamulis testaceis, stigmate nervisque fuscis : E. 



