A REVIEW, AND A REVISION IN GREATER PART, OF THE CTENISCINI OF THE OLD WORLD (HYM., ICHNEUMONIDAE) By G. J. KERRICH COMMONWEALTH INSTITUTE OF ENTOMOLOGY, AND HONORARY ASSOCIATE OF THE BRITISH MUSEUM (NATURAL HISTORY) [Received for publication on 10 May 1951] INTRODUCTION ............... 307 DESCRIPTIVE TERMS .............. 309 DISCUSSION OF SOME CHARACTERS, AND OF METHODS . . . . . . . . 311 DISCUSSION OF GENERA ............. 313 KEY TO GENERA .............. 316 GENUS ACROTOMUS HOLMGREN ............ 319 GENUS ANISOCTENION FORSTER 321 Key to species of Anisoctenion ............ 350 GENUS EXENTERUS HARTIG 354 Key to species of Exenterus ............ 364 GENUS EXYSTON SCHIODTE 367 Key to species of Exyston ............ 389 GENUS PAREXYSTON, GEN. NOV. ............ 392 GENUS SMICROPLECTRUS THOMSON 393 Key to species of Smicroplectrus . . . . . . . . . . .412 GENUS EUDIABORUS, GEN. NOV. ............ 413 GENUS CTENISCUS (HALIDAY MSS.), CURTIS, THOMSON . . / 420 Key to 'black-bodied' species of Cteniscus .......... 443 CONCLUSION ............... 451 SUPPLEMENT ............... 452 REFERENCES ............... 455 APPENDIXES ............... 458 SYNOPSIS The systematic position and characters of the tribe are briefly reviewed, and there follow discussions of some descriptive terms and some characters used in this study. The genera are discussed from the points of view both of taxonomy and nomenclature, and a new key to genera is given, taking account of the Old World species and of those from the New World known to the author. The genera Anisoctenion, Exyston, Smicroplectrus, and the 'black-bodied' species of Cteniscus are fully revised, with descriptions of old and new species and with keys. Much fresh European information on the genus Exenterus is given, with a key to the Old World species. The remaining sections are less fully treated. Altogether two new generic names are proposed, and ten new species are described, with one new variety and one aberra-tion named. Some new synonymy is given. The paper is illustrated by eighty-six text-figures and four plates. INTRODUCTION THE subfamily Tryphoninae, to which the Cteniscini belong, has recently been re-defined by Townes & Townes (1949) to include all those ectoparasitic genera in which there is a large or rather large stalked egg, of which only the anchor passes down the
BioStor
