It was the opinion of Latreille and Esenbeck that Proctotru- 

 pes is allied to Helorus (pi. 403), and Mr. Haliday considers 

 that it connects Diapria (Psilus) and Ceraphron (pi. 24'9). I 

 must confess I expected to find it related to Cynips, and being 

 unable to enter upon its affinities, I shall pass on to an ex- 

 amination of the ovipositor, which offers some peculiar cha- 

 racters. In the Ichneumonidae this organ is either porrected 

 or elevated, but in ProctoLrupes it is deflexed. Like that 

 family, however, it has 2 sheaths inclosing a compound ovi- 

 duct composed of 3 pieces, as shown in Pimpla (pi. 214. f. 6), 

 but in Proctotrupes these are acuminated, and the lateral ones 

 have their points securely fixed in the central one, the apex 

 of which forms a cap for them : the most remarkable part of 

 the structure, however, is an additional valve a little longer 

 than any of the others, rather broad and membranous, with 

 a thickened rib down the middle, the apex rounded (fig. m.) : 

 never having seen more than 5 pieces in any ovipositor inclu- 

 ding the sheaths, I cannot at present determine its functions. 

 I rejoice to see that Mr. Haliday has commenced publish- 

 ing Monographs on the Oxyuri, as they will enable those en- 

 gaged in the study of these minute Hymenoptera to derive 

 every advantage from his elaborate investigations. The fol- 

 lowing sections and species form his 1st fasciculus. 

 A. Metathorax rugose. Both sexes whiged. 

 B. Claws of anterior feet with appendages. 



I. niger Panz. 85. 9? 2. ater Esen. 2. 359. 8. 



3. WgdiVns Esen. 359. 9. — basalis, minor, monilitor of Guide,vars, 



4. brevicomis Guide, 575. 14. 5. longicornis Esen. 358. 7. 



B.B. Claws entire. C. Petiole conspicuous. 

 D. Sides of prothorax roughish. 



6. gravidator Linn. — campanulator Fah. — Ahr. 5. 16. — ■ 

 brevipennis Lat.? Gen. Crust. 4;. pi. 13. f 1. 



7. gladiator Hal. p. 10. n. 7. 8. bicolor Hal. 10. 8. 



D.D. Sides of prothorax very smooth. 



E. Scutel of mesothorax smooth. 



9. elongatus Hal. 11.9. 10. pallipes Jur. pi. 1 3. gen. 46 ? . 



II. viator Hal. 12. 11. 12. curtipennis. Guide., 575. 8. 

 13. calcar Hal. 12. 13. 14. fuscipes Guide, 575. 10. 



E.E. Scutel of mesothorax bisidcated. 



15. areolator Hal— Curt. B. E.pl. 744. ? .— ephippium Guide 

 n. 17. 



This is the most variable of all the species, the thorax being 

 sometimes piceous. Mr. Walker gave it me many years since. 

 C.C. Petiole concealed. 



16. aculeator Hal. 14. IG. 



17. LaricisHiz/. 14. 17. On larch-trees infested with Aphides. 



18. parvulus Esen. 360. 10. Females gregarious inboleti, in- 

 festing the larvae of Mycetophila in the autumn. 



A.A. Metathorax smooth. 



19. apterogynus Hal. 15. 19. 



The plant is Picris hieracioidcs, Hawkvveed Ox-tongue. 



