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University of Minnesota Extension

Species detail

Trypoxylon sp. (Spider wasps)



Trypoxylon is a genus of wasps in the family Sphecidae There are many species of Trypoxylon in North America. We have at least 2 from the MN Bee Atlas but ID is ongoing.


Trypoxylon sp. have long lumpy abdomens that arc down. They are typically dark with little or no coloring. They do not fold their wings at rest. They range from medium-sized to the size of a grass-carrying wasp (Isodontia mexicana).

Nest Structure

Trypoxylon sp. are solitary-nesters; each female builds her own nests. They typically use mud or sand to build their nest cells and plugs. Plugs frequently have a smooth outer surface. This is in contrast to the bee Osmia lignaria that also uses mud, but tends to have chunkier, rougher-looking nest plugs. Trypoxylon stock their nests with paralyzed prey, as is typical of solitary nesting wasps. Prey choices are generally spiders.

Hole Sizes

Trypoxylon nest in all hole sizes in Bee Atlas blocks.


Trypoxylon can have 2 generations per year in Minnesota.

Activity Period

Summer into early fall.


No information at this time.

Minnesota Record Map

These data are from the Minnesota Bee Atlas project.

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