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Psenini (tribe)
About 6 millimeters in body length, colored as shown. Note long petiole linking thorax and abdomen.
This wasp was eating sweet exudates from the stems, leaves, and buds of a common sunflower (Helianthus anuus) at the edge of a vast field of heavily degraded shortgrass prairie with yucca, prickly-pear cacti, and scattered elm trees.
Very difficult to identify these even to genus from images of living specimens alone.
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