Bombus affinis, commonly known as rusty patched bumble bees were once common throughout the east and upper Midwest but its population has recently had a drastic decline. The USFWS listed the rusty patched bumble bee as Endangered under the Endangered Species Act.
Rusty-patched bumble bee worker diagnostic traits:
- Thorax – black hairs in the shape of a thumb tack
- 1st abdominal segment – yellow
- 2nd abdominal segment - Rust colored patch on the middle and front half and yellow on the rear half
- Remaining abdominal segments – black
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View Verifiable Observations of Bombus affinis on INaturalist: https://www.inaturalist.org/taxa/121519-Bombus-affinis
USFWS Rusty Patched Bumble Bee Map: