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Species Acrotaphus wiltii

Ichneumon? - Acrotaphus wiltii - female Wasp IMG_1567 - Acrotaphus wiltii - female unidentified ichneumon wasp - Acrotaphus wiltii - female Acrotaphus wiltii ?? - Acrotaphus wiltii Ichneumon Wasp - Acrotaphus wiltii Acrotaphus wiltii? - Acrotaphus wiltii Orange wasp with black head and antennae - 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" (parasitic Apocrita))
Superfamily Ichneumonoidea (Braconids and Ichneumons)
Family Ichneumonidae (Ichneumon 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: