ATTENTION : This key treat only of Genera having at least one species which the length of forewing is ≥ 5.5 mmHowever I added the species having a length of forewing slightly lower than 5.5 mm
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Biblio. (Main)
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van Rossem 1980/1991 :The Author studied all the Microleptinae, all his publications (PDF) are on the Net, 
excepted: 1983 - "A revision of Western Palearctic Oxytorine genera. Part III: Genus Proclitus ..."
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Schmiedeknecht 1906/1908 : in "Opuscula Entomologica" - Part 16/18
on the Net (see with http://www.biodiversitylibrary.org)
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Townes 1969/1971 : The Genera of Ichneumonidae - Part 1 & 4
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See also my diverse Messages titled :
"Adaptation for the ♂ & ♀ (of France and Italy) of the subFamilies's Key ...]" 
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The Tribes & Genera are sensu 
Townes(
sensu Townes) : 
Microleptinae = (
sensu FE) : 
Cyllocerinae +
Microleptinae + 
Orthocentrinae + 
Oxytorinae= (sensu van Rossem) : Oxytorinae
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Drawings from 
Townes-----------------------------------------keywords :
Hymenoptera Ichneumonidae Microleptinae Oxytorus armatus Plectiscidea Allomacrus arcticus Cylloceria Aperileptus albipalpus Hyperacmus crassicornis  luridator Proclitus tricolor praetor Megastylus elegans cruentator