Sceliphron caementarium (Drury) 1773. This black and yellow mud dauber is probably the most widespread and familiar of the sphecines, due to its synanthropic habits. Transported via cargo, it has established itself in Europe, Australia, and many Pacifc Islands (Bohart and Menke 1976). In the New World, S. caementarium occurs from southern Canada to Central America and the West Indies (Krombein 1979). It is found over much of Michigan, and is probably more widespread in the UP than collection records indicate.
BIOLOGY: Multicelled mud nests are constructed in sheltered spots such as sheds, barns, picnic pavilions, and attics. Spider prey belong mostly to the families Araneidae and Thomisidae (Rau 1935b, Muma and Jeffers 1945, Shafer 1949, Horner and Klein 1979). A favorable site may be used for many years, sometimes resulting in an enormous conglomeration of nests being occupied by both Chalybion californicum and S. caementarium.
FLOWER RECORDS: Berberis vulgaris, Clematis virginiana, Daucus carota, Pyracantha sp., Spiraea sp.
COLLECTION DATES: 250 specimens, 24 May to 1 October. Most records are from late June to early August. Wasps emerging in greenhouses in Michigan have been seen as early as mid-March.
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