Figs. 1–12. Eustenogaster nigra holotype and paratypes. Scale bars are 1 in A New Eustenogater Species (Hymenoptera: Vespidae; Stenogastrinae), the First Hover Wasp Known to Overwinter on the Nest

Figs. 1–12. Eustenogaster nigra holotype and paratypes. Scale bars are 1 mm. 1–3. Eustenogaster nigra Saito and Nguyen, n.sp., female holotype. Head. 1. Frontal view. 2. Lateral view. 3. Dorsal view. 4–6. Second metasomal tergum in lateral view. 4. Eustenogaster nigra Saito and Nguyen, n.sp., female. 5. E. nigra, male. 6. E. scitula, female. 7. Eustenogaster nigra Saito and Nguyen, n.sp., female paratype. Sixth metasomal