44 BRITISH ICHNEUMONS. [Ephtaiies. 



linear and distinctly punctate throughout, with the apices of the segments 

 glabrous and transversely subaciculate ; basal segment of 9 subquadrate, 

 of (J twice longer than broad, nigrescent; the second elongate, with the 

 third to fifth of e(}ual length and longer than broad, rufopiceous with the 

 apical margins always black ; abdomen of J usually black, with the second 

 and third segments narrowly testaceous basally; venter stramineous, J 

 valvulae elongate ; terebra very slender, pilose and longer than body with 

 the spicula fulvous. Legs fulvous or red, with the anterior coxae flavous ; 

 hind tarsi apically infuscate, with the apical joint about twice longer than 

 the penultimate ; claws simple and curved, with the pulvilli not small; ^ 

 trochanters stramineous, the hind ones often narrowly nigrescent above. 

 Wings with the stigma and radix pale stramineous, and the areolet irregu- 

 larly transverse-triangular; ordinary transverse nervure interstitial, nervel- 

 lus subopposite and intercepted in its centre. Length, lo — 12 mm.; 

 terebra 15 mm. 



Marshall treated this as a good species in 1870, but in his later Cata- 

 logue synonymised it with Thalessa ( Rhyssa) clavata, Fab., from which 

 the female materially differs in not having the mesonotum trans-striate, 

 the face and basal segment immaculate, in its red scutellum and smaller 

 size. Bridgman {loc. cil.) says it is a true Ephialtcs and points out that, if 

 T. clavata were introduced as British on the strength of this erroneous 

 association, the latter must be omitted from our fauna. This is evidently 

 the case, since Marshall has marked the whole Thalessa article in his 1872 

 Catalogue "■ delendus'' and entered E. ruficollis, Desv., under Ephialtes. 

 In coloration it is closely allied to Pcrithous ; but the immaculate and 

 pilose face, red scutellum and the relative length of the hind tarsal joints 

 will at once distinguish it. It further has somewhat the facies of an ex- 

 tremely elongate Pimpa pomorum. 



Desvignes' three female co- types are in the British Museum and I have 

 drawn somewhat largely from them in the above description. An exam- 

 ple of each sex has been bred by Barrett from an uninstanced lepidopter- 

 ous host, and they are in the Bridgman collection at Norwich. I also 

 possess a single specimen of both sexes; the female was captured at 

 Cannoch Chase by Mr. B. Tomlin during the first week of June, 1904, 

 and the male taken by Dr. Capron about Shere, in Surrey, some twenty 

 years ago. 



PERITHOUS, Holmgren. 



Holmgr. Ofv. 1859. p. 123; Sv. Ak. Handl. 1860, n. 10, p. 15. 



Head not buccate and behind the eyes distinctly constricted; frons 

 unevenly impressed above the scrobes ; face subtransverse and narrower 

 than frons ; clypeus arcuately discreted, deplanate, apically deeply emar- 

 ginate though rarely subtruncate ; mandibles basally broad, with teeth of 

 equal length ; juxta-antennal orbits slightly emarginate. Antennae fili- 

 form, with the scape excised. Thorax stout, longer than high, and later- 

 ally strongly nitidulous, usually tricolored; sternum deeply canaliculate 

 and apically immarginate; notauli distinct; metathorax with the coxal and 

 petiolar areae entirely punctate, the latter discreted from the wanting or 

 incomplete areola by an arcuate costa; spiracles usually ovate. Abdomen 

 subcylindrical and punctate, with the apices of the segments smoother ; 

 the first or first two longer than broad ; the three following subquadrate, 

 rarely elongate, with subobsolete lateral tubercles; terebra as long or 



