A Generic Classification of the Nearctic Sawflies (Hymenoptera, Symphyta): With Seventeen Plates (Classic Reprint) - Softcover

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Excerpt from A Generic Classification of the Nearctic Sawflies (Hymenoptera, Symphyta): With Seventeen Plates

In the Siricoidea, Plate II, fig. 18, a groove (gr) is present, running ventrad or caudad of the antennal sockets, which receives the basal segments of the antennae in repose.

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