E. Reitter: "Fauna Germanica", Band 1 (1908). Table 34

Table 34, band 1

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1. Hydroporus depressus
 2. Hydroporus elegans
 3. Hydroporus assimilis
 4. Hydroporus halensis
 5. Hydroporus septentrionalis
 6. Hydroporus granularis
 7. Hydroporus bilineatus
 8. Hydroporus oblongus
 9. Hydroporus umbrosus