May 2018
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1 Ovipositor length over 0.5x gaster length; marginal vein length about 2x width; fore coxa dark ……..……..……. marilandicus
1′ Ovipositor length no more than 0.3x gaster length; marginal vein punctiform; fore coxa yellow ……………………………………………..… sp. 1
Sp. 1: Stanislaus (UCFC)
Described Nearctic species and distribution
marilandicus Girault, 1917: USA (CA, IN, MD, NH, WI)
pallipes (Provancher, 1887): CAN (ON)
Remarks
The marginal vein of C. pallipes appears slightly shorter than sp. 1. UCF has 4 Cerchysius specimens (3 females) from a malaise trap at the same location. Two of the females have the notum bronzy, the scape length about 4x the width, and the legs all yellow except for a dark metacoxa, and hind tibia somewhat darkened posteriorly. The third female has the notum green, the scape length about 3.5x the width, and the legs all yellow (including metacoxa and hind tibia). I consider the two forms conspecific.
References
Girault, A.A. 1917. Description of miscellanous chalcid flies. Insecutor Inscitiae Menstruus 4: 109-121.
Provancher, L. 1887. Faune entomologique de Canada, 2. Additions et corrections à la faune
Hymémenoptèrologique de la province de Québec: 165-272.