22 



BRITISH ICHNEUMONS. 



Scutellum somewhat flat, rarely entirely pale. Abdomen often blue-black, 

 more rarely castaneous towards the apex ; with post-petiole centrally 

 striolate and generally also punctate at the apex ; second segment with 

 gastrocaeli and thyridii large and very deep ; incisures of central segments 

 usually profound ; terebra slightly exserted, anus sub-truncate, immaculate. 

 Legs stout, the tibiae normal. VVings often clouded. 



The species of this genus are somewhat large and stout insects, super- 

 ficially resembling the larger ones of Alelanichneumon, &.C., but at once 

 distinguished by their more robust contour, often metallic reflection and 

 the conformation of the metathorax. Usually they are black with small 

 white markings and never bear the clear red of Ich7ieumo7i and Barich- 

 ?ieumon, though some have the abdomen more or less castaneous. They 

 appear to prey mainly upon Noctuid moths, but the records of the older 

 collectors must always be to a great extent doubtful regarding these closely 

 allied parasites. 



Table of Species. 



Abdomen caerulescent, centrally distinctly 



Abdomen elongate-oval ; venti^ally 

 not plicate i. 



Abdomen sulD-equilateral ; ventrally 

 distinctly plicate. 



Post-petiole apically always white- 

 marked 2. 



Post-petiole nearly invariably im- 

 maculate 3. 



Abdomen not or scarcely cyaneous ; 

 centrally immaculate. 



Tibiae broadly white-marked. 



Scutellum apically white ; scopulae 

 distinct 4. 



Scutellum black ; scopulae wanting.. 5. 



Tibiae not white-marked (excl. (5 of 8). 



Central segments basally deplanate. 



Scutellum entirely or half white, its 

 basal carinae immaculate. 



Capital vertex broad ; stigma fulvous 6. 



Capital vertex narrow ; stigma fus- 

 cous 7. 



Scutellum rarely white at apex, its 

 basal carinae very often pale. 



Petiole thrice longer than apically 

 broad ; scutellar carinae immacu- 

 late. 



Clypeus truncate ; incisures red ; 

 scopulae distinct 



Clypeus bisinuate ; incisures not red ; 

 scopulae wanting. 



Antennae compresso-dilated ; areola 

 sub-quadrate ; legs mainly black. 



Areolet broad above ; S with tlagel- 

 lum black 9 



Areolet deltoid ; S flagellum red 

 beneath 10, 



Antennae sub-filiform ; areola hexa- 

 gonal ; legs mainly red 11. 



^^•hite-marked. 

 BOHEMANi, Holmgr. 



SUGILLATORIUS, LitUt. 

 CYANIVENTRIS, WesiH. 



FUSCIPES, Gmel. 

 PERISCELLS, Wesm. 



SINISTER, Wesm. 

 LEUCOCERUS, Grav. 



8. COMITATOR, Linn. 



DERASUS, Wesm. 



BILINEATUS, Gl'tlV. 

 CONSIMILIS, Wesm. 



