INTRODUCTORY PAPERS ON ICHNEUMONIDS. 101 
+ Front femora and tibie red, apex of hinder one black (male and 
female). - - - - - - 20. vicinus, 2 lines. 
c. First and 2nd segments of abdomen coarsely aciculate ; mouth and 
legs red; antenne of female with a narrow white ring (male and 
female). - : : - - - Al. niger, 3 lines. 
Sxcrion 2.—Thorax black; abdomen black; apical margins of 
intermediate segments pale yellow. 
First and 2ud segments aciculate; aculeus one-third of abdomen 
(male and female). —- - - - marginatus, 24 lines. 
Section 3.—Thorax black; abdomen red and black ; apex sometimes 
whitish. 
Metathoracic spiracles small and circular. 
A. Antenne tricoloured (females). 
a. Second segment and legs*fulvous; apex of hind femora and tibice 
black; aculeus about one-sixth of abdomen. 3. varicornis, 1 line. 
b. Margin of Ist and the 2nd segment red ; last segments, legs and mouth 
stramineous; aculeus hardly half of abdomen. 
18. contaminatus, 2 lines. 
B. Antenne bicoloured (white ringed) (females). 
Segments Ist to 3rd and legs almost entirely red. 
a. Abdomen smooth and shining; aculeus about half of abdomen. 
biannulatus, 2—2% lines. 
b. Abdomen finely and closely punctured; aculeus about one-third of 
abdomen; wings with a fuscous band behind the stigma. 
subannulatus, 24 lines. 
C. Antenne black, or red at the base. 
a. Second segment of abdomen without sculpture. 
* Metathorax sloping from front to back, not angulated. 
First segment long and slender; middle of abdomen reddish 
stramineous (|), or stramineous ({t). 
+ Hind legs more or less dark (male). - - 5. imbecillus, 2 lines. 
++ Hind legs pale (male and female). —- : 7. necator, 1 line. 
«* Back part of metathorax almost at right angles to the front part. 
{ Stigma white at the base. 
Middle of abdomen and greater part of legs red; aculeus about half 
of abdomen. 
§ Coxee black. 
First segment of abdomen with deep, scattered punctures (male and 
female). - - - - - 27. ridibundus, 24 lines. 
§§ Coxe almost entirely red. 
x First segment of abdomen aciculate; wings of female with fuscous 
band (male and female). - - 11. owyphimus, 24 lines. 
x First segment smooth; wings without band (female). 
politus, about 2 lines. 
Stigma not white at the base. 
Antenne much thickened (as in Phygadeuon). 
Abdomen lighter or darker chestnut; apical margin of anterior 
segments paler, and legs more or less pale, as well as base of 
antenne ; aculeus one-third of abdomen (female). 
12. crassicornis, about 1 line. 
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