What feature distinguishes the female Red-tailed Cuckoo Bee (*B. rupestris*) from the female *B. lapidarius*?
Answer
The female Red-tailed Cuckoo Bee has dark, smoky wings
The female of the Red-tailed Cuckoo Bee shares the color pattern of *B. lapidarius*, but is uniquely identified by having dark, smoky wings, whereas true red-tailed bumblebees have transparent wings.
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