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Northern Prairie Wildlife Research Center

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Caterpillars of Eastern Forests

Yellow-marked Caterpillar (Raphia frater) [The Brother]

JPG-Photo of Yellow-marked Caterpillar

Stocky, bright green with 3 narrow yellow dorsal saddles on first, fifth, and eighth abdominal segments—these sometimes edged anteriorly with red and black spots. Dorsum of second thoracic segment with closely set red tubercles. Handsomely dappled with yellow spots; red spotting may surround spiracles. Abrupt brother (R. abrupta), co-occurs with R. frater but tends to be far less common. Food: especially poplars but also alders, birches, and willows. Caterpillar: June to September; apparently 1 generation.

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