Taken from:
R. M. Bohart and L. S. Kimsey. 1982. A Synopsis of the Chrysididae in America North of Mexico.
Muesebeckidium obsoletum (Say)
Hedychrum Say 1836:284. Holotype female, Indiana, destroyed.
Hedychrum zimmermanni Dahlbom 1845:2. Holotype male, New Jersey (Lund).
Discussion: This species is distinguished by the dark, finely and sparsely punctate abdomen. M. obsoletum is found east of the 100th meridian in the Upper and Lower Austral Life Zones.
Material examined: 10 males, 14 females.
Distribution: Indiana, Iowa, Michigan, Georgia, North Carolina, Maryland, Connecticut, New York, New Jersey, Delaware, Pennsylvania, Florida, Tennessee, Ohio, Illinois, Minnesota, Kansas, Nebraska and Ontario. Collection dates are May through July.
Muesebeckidium Krombein
Hedychrum of Say, in part.
Muesebeckidium Krombein 1969. Generotype; Hedychrum obsoletum Say 1836, original designation.
Diagnosis: Head, pronotum, scutum and terga finely and sparsely punctate; pronotum laterally carinate (fig. 45); mesopleuron sharply edged and extending strongly forward, scutellum sharply declivous along anterior margin; forewing with arched basal vein (fig. 45); forefemur ecarinate; female fore and midtarsi flattened (fig. 47), laterally expanded and appearing prehensile; tarsal claws with large subparallel tooth and two small basal ones; male genitalia with volsella small and undivided, digitus absent (fig. 46).
Discussion: Species of Muesebeckidium are easily distinguished by the robust angular body and sparsely punctate pronotum, head and abdomen. Superficially these species resemble members of Holopyga based on the wing venation and tarsal claw dentition. However, the male genitalia, female foretarsi and structure of the thorax of Muesebeckidium are quite different. No host is known for species of Muesebeckidium.
Key to species of Muesebeckidium
Terga purple to black, punctures small, about 2.0 PD apart; east of 100th meridian …………………………………………………………………….obsoletum (Say)
Terga blue or blue green, punctures large, 1.0 PD apart or less; New Mexico,
Arizona and Mexico ………………………………………..occidentale Krombein
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