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Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region
Matthias Buck, Stephen A. Marshall, and David K.B. Cheung
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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56. Stenodynerus fundatiformis (Robertson, 1901)
Species recognition. This species is part of the S. propinquus-group, which is distinguished from all other Stenodynerus (and Parancistrocerus) by the presence of a short humeral carina that curves posteriorly at the humeral angle. The only representative of this group in our area is S. fundatiformis. A second species, S. propinquus, occurs from NC and AL westward and is distinguished from S. fundatiformis by the angulate outer surface of male flagellomere XI (evenly and gently curved in S. fundatiformis) and the medially distinctly angled transverse carina of sternum 1 (forming a small, medial, rounded or slightly angled projection in S. fundatiformis).
Variation. Fore wing length 6.5–8.0 mm (♂♂), 7.0–8.0 mm (♀♀). Variation otherwise not studied.
Distribution. Not recorded from Canada. Eastern U.S.: NY to FL , west to MN, MO, AR and TX (Bohart 1944, Krombein 1979). The reddish-marked southern form (SC to FL, west to MO, AR, TX) is the nominate subspecies. The yellow marked northern form has been named ssp. gonosceles Bohart, 1944.
Biology. The nominate subspecies nests in both sandy and hard-packed soil. Prey consists of case-bearing leaf beetle larvae (Chlamisinae) and leaf-rolling or case-bearing caterpillars of Pyralidae, Gelechiidae, Tortricidae (Olethreutinae), Geometridae and Psychidae (Evans 1956, Krombein 1964).
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