INTRODUCTORY PAPERS ON ICHNEUMONID&. 103 
§ Antenne very slightly compresso-dilated before the apex. 
9. leucocerus, 74—9 lines. 
§§ Antenne distinctly compresso-dilated before the apex. 
x Areolet of wing pentagonal. 10. lineator, 6—9 lines (t, s, J, a). 
x x Areolet of wing triangular. - - - 12. mestus, 3—4z lines. 
tt Vertical orbits of eyes not spotted with white; lateral margins of 
scutellum white. 
o Stigma nigro-fuscous. - - 25. trilineatus, 6—8 lines (I, a). 
oo Stigma red. - - - - 26. scutellator, 5—6 lines (a). 
+} Gastroceli of 2nd segment almost entirely absent. 
+ Ares of metathorax, five complete. - 78. jugatus, 5—6 les. 
++ <Arez of metathorax, three complete. 80. rufifrons, 24—6 lines (a). 
b. Tibie (especially the hind one) with white ring. 
* HFemora and part of tibiz red. 71. fabricator, 5—7 lines (s, a). 
Smaller and external radial nervure incuryed. 
72. curvinervis, 24—4 lines (s). 
«* Hind femur and part of tibia black. 
+ Face black. - - : 22. pistorius, 7$—8 lines (¢, a). 
{+ Face with the orbits white. 
{ Middle area of post-petiole aciculate-punctated. 
20. fuscipes, 6—9 lines (a). 
tt Middle area smooth, or with a few punctures. 
87. oscillator, 74—9 lines (h. t, s). 
A. Antenne white-ringed (males). 
* Post-petiole aciculate(t) or punctate-aciculate(t{). 
+ Inner orbits and marks in front of wings white. 
{ Scutellum white and legs black. 
§ Tibiz without white marks. - - - 8. sinister, 74—8 lines. 
§§ ‘Libiee with white marks. - 22. pistorius, 7}—104 lines (h, a). 
tt Scutellum, lateral margins white; legs vary from greater part red 
to quite black (antenne generally without ring). 
25. trilineatus, 6 —8 lines (J, a). 
++ Face and marks before wings white. 
** Post-petiole alutaceous ( X ) or scabriculous (xX x ). 
x So ir area of metathorax semicircular. 
70. punctifrons, 4—5 lines (s ). 
x X Supero- edi area of metathorax quadrate. 
99. ochropus, 4—5¥% lines. 
B. Antenne not white-ringed (males). 
a. Tibiee (especially the hinder one) ringed with white; legs the 
greater part black. 
* Middle area of metathorax striated (aciculate). 
+ Hind tarsi not marked with white. 20. fuscipes, 6—9 lines (a). 
++ Hind tarsi marked with white. 27. multiannulatus, 6—8 lines. 
** Middle area of metathorax smooth, or with a few punctures. 
t Gastroceeli of 2nd segment of abdomen obsolete. 
80. pallidatorius, 24—6 lines. 
tt Gastroceli of 2nd segment distinct. 87. oscillator, 74—9 lines. 
b. Hind tibie not marked with white. 
* Front coxe white, or marked with white. 
+ White marks on the angles before the scutellum. 
11. aldicillus, 54 lines. 
