Krombein et al.
(1) cite
Sphex ichneumoneus as a questionable host record. BugGuide contributors have observed
Nysson plagiatus entering burrows of
S. ichneumoneus(great golden digger wasp)
(2) and
S. nudus (katydid wasp)
(3). This is in contrast with its allies, which may be associated with
Tachytes.
(4)