Extension > Garden > Diagnose a problem > What insect is this? > General/curiosity insects > Insects with obvious wings: ¾ - 1 inch long > Black and yellow mud dauber

Black and yellow mud dauber

Sceliphron caementarium

Jeff Hahn, University of Minnesota Extension

Howard Ensign Evans, Colorado State University, Bugwood.org

Description: 3/4 - 1 inch long. Black with mostly yellow legs and yellow markings on its thorax.

Where/When: Construct small nests of mud under overhangs like eaves of buildings. Found around flowers, gardens and mud puddles, and buildings and other sites where they construct their nests; found June through August.

Significance: Not aggressive, stings are rare. Does not harm buildings where they build their nests.

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