BRITISH ICHNEUMONS. II 5 



all other indigenous insects. Though the sexes are similar in several 

 points, their facies are so divergent that it is perhaps better to describe 

 them separately. 



? . Head hardly narrowed behind the eyes, black ; mouth and frontal 

 orbits usually reddish. Antennae sub-filiform, sixth joint quadrate ; 

 white-banded, basal joints ferrugineous. Thorax black ; callosity below 

 the radix, the scutellum always, and sometimes pronotum, white ; meta- 

 notum scabrous, with only three upper areae ; areola quadrate, emarginate 

 apically, costae not strong. Abdomen elongate-ovate, black ; post-petiole 

 aciculate throughout, gastrocaeli normal ; segments two and three red, 

 the latter basally black, sixth white-banded, seventh entirely black. Legs 

 stout, red ; coxae, trochanters, apices of hind femora and tibiae black ; 

 scopulae black, normal. Wings hyaline, stigma fulvous ; costa, radix and 

 tegulae reddish. 



^. Palpi, clypeus more or less, facial orbits, or sometimes almost the 

 whole face, flavous. Antennae piceous ; flagellum ferrugineous, and 

 scape pale flavous, beneath. Thorax black ; pronotum, lines at radix 

 and scutellum pale stramineous ; areola rectangular, transverse. Abdomen 

 sub-parallel-sided, black ; post-petiole aciculate throughout, gastrocaeli 

 normal ; first segment usually margined or bimaculate apically, two, 

 three and six margined throughout, four to seven with a narrow inter- 

 rupted margin stramineous, more rarely flavous ; fifth entirely black. 

 Legs flavous, tibiae lighter ; coxae, trochanters and apices of hind femora 

 and tibiae black. Wings flavescent hyaline, stigma and radix fulvous, 

 tegulae flavous. Length, 10-14 mm. 



The only species at all resembling the above is I. repetitor, Kriechb. 

 Ent. Nachr. 1881, $ ?, ( = /. critiais, Tisch. Stett. Zeit. 1881, c^ ) which 

 has the body rather more strongly sculptured, the ? with sixth segment 

 maculated, not margined with white, and no pale callosity beneath the 

 radix, the <? has segments two to four entirely or mostly flavous, and the 

 two apical segments white throughout. It is unlikely to occur in Britain, 

 however, being, as far as is at present known, a South European species. 



/. sarcitorius is among our commonest and handsomest insects. The 

 males are frequently found on flowers of Angelica sylvestris and Daucus 

 carota in the autumn, from August to October ; they fly low, among the 

 herbage and are difficult, on account of their coloration, to follow with 

 the eye ; the females, which hibernate as imagines, may be shaken from 

 tufts of grass {Ah-a caespitosa, etc.) during the winter, and I have also 

 found them among marram grass on the coast. St. Ives, in July and 

 August ; West Hide, at end of May ; Lizard, early in .4ugust (Wain- 

 wright) ; Alderney and Guernsey (Luff) ; Fairlight and (iuestling (Bloom- 

 field) ; Chobham, in July (Saunders) ; Cadney, Retford, Mablethorpe 

 and South Leverton, in May, July and September (Thornley) ; Tostock 

 and Bungay (Tuck); Chiddingfold (Donisthorpe) ; Claydon, Aldeburgh, 

 Lowestoft, Ipswich, Barham, \Vestleton and Bentley woods, all Suffolk ; 

 Oxshott, in July (Morley) ; Plym Bridge, Devon (Bignell, who has ob- 

 served it ovi[)ositing in a larva oi Arctia vienthastri) ; common in Norfolk 

 (Bridgman); Gareloch Head (Murphy) ; Shipley (Gorham) ; King's Cross, 

 Arran, in August (I)alglish) ; Felden, Herts. (Piffard) ; Shiere (Butler); 

 Littlehampton (Elliott); Weymouth (Bradley); Kenmare, early in July 

 (Yerbury) ; Kilmore, Catford, Chobham, Plumstead and Colwyn (Beau- 



