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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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44. Parancistrocerus histrio (Lepeletier, 1841)
Species recognition. Other Parancistrocerus and Stenodynerus with entirely black metasomal segments 3–6 differ as follows: P. perennis has a bluntly angulate sternum 2 (evenly convex in P. histrio), S. histrionalis has an uninterrupted pronotal carina (broadly rounded over medially in P. histrio), P. fulvipes has large yellow discal spots on tergum 1 (absent in P. histrio but sometimes with small ferruginous spots instead, or else disc of tergum 2 largely ferruginous), and S. lineatifrons and S. histrionalis have a pitted basal groove of tergum 2 (i.e., acarinarium absent; basal groove smooth and acarinarium present in P. histrio). Further diagnostic characters of P. histrio are: dorsal surface of pronotum very coarsely punctate and with small interspaces; propodeum very coarsely rugose with a distinct horizontal shelf-like area behind metanotum; male mid femur without distinct anteroventral depression near base; wings strongly infuscated at least in female; summit of tergum 1 with irregular, transverse carina formed by enlarged, confluent punctures; dorsal surface of tergum 1 essentially flat; hind margin of tergum 2 not thickened.
Variation. Fore wing length 6.0–7.0 mm (♂♂), 8.0–9.0 mm (♀♀). Variation otherwise not studied.
Distribution. Not recorded from Canada. Eastern U.S.: newly recorded from DE (1 ♀, Augustine Beach, 1 ♀, Fenwick I., both DEBU) and MD (1 ♀, Port Republic, CNCI; 2 ♂♂, 1 ♀, Assateague I., DEBU); DC to FL and LA (Krombein 1979).
Biology. Nests in borings in wood. Closing plugs and nest partitions are made from firmly agglutinated sand. Prey consists of caterpillars (Krombein 1967, 1979).
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