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For Insects, Spiders & Their Kin
For the United States & Canada
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Species Acrotaphus wiltii

Ichneumon Wasp - Acrotaphus wiltii insect unknown01 20120716 - Acrotaphus wiltii - female Is this Acrotaphus wiltii? - Acrotaphus wiltii ichneumonid 3 - Acrotaphus wiltii Superfamily Ichneumonoidea? - Acrotaphus wiltii ichneumon wasp? - Acrotaphus wiltii Ichneumon Wasp - Acrotaphus wiltii Acrotaphus Wiltii - Acrotaphus wiltii - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" - Parasitoid Wasps)
Superfamily Ichneumonoidea (Braconid and Ichneumonid Wasps)
Family Ichneumonidae (Ichneumonid Wasps)
Subfamily Pimplinae
Tribe Ephialtini
No Taxon (Polysphincta Genus Group)
Genus Acrotaphus
Species wiltii (Acrotaphus wiltii)
Synonyms and other taxonomic changes
Acrotaphus wiltii (Cresson, 1870)
♀ ~15mm
♂ ~12mm
Fairly distinctive, with black bands on yellowish wings. More slender than species in similar genera with banded wings.

e. N. Amer. (QC s. to n. FL, w. to s. MB and TX)
Life Cycle
Parasite of the arabesque orb weaver, Neoscona arabesca. The wasp stings the spider to briefly paralyze it while she lays a single egg on it. The larva is an external parasite.
Larvae on host Spiders:
See Also
The very similar Mantidfly larvae are usually smaller in size, compared to the host Spider: