Acorystus Townes

Scherrer, Marcus V., Santos, Bernardo F. & Aguiar, Alexandre P., 2010, Generic redefinition, key and two new species of Acorystus To w ne s (Hymenoptera: Ichneumonidae: Cryptinae), Zootaxa 2721, pp. 28-38 : 31

Key to the species of Acorystus Townes

1. Head orange, ferruginous near ocelli. Propodeum surface irregular, rugose, with large punctures that are separated from each other by about 1.3x their own diameter ( Figs 12, 13 ) ........................................................ A. fulvus Townes

- Head black with whitish marks. Propodeum smooth, with very short punctures that are separated from each other by at least 4.0x their own diameter .................................................................................................................................... 2

2. Female flagellum with white band covering about 5 flagellomeres. Supra-antennal area with a white horn ( Fig. 4 ). Orbital band present from supra-clypeal to supra-antennal areas. Propodeum with anterior transverse carina centrally not strongly arched forward, with about the same curvature on its entire length ( Fig. 3 ). Crossvein 1cu-a basad of 1M+Rs by about 0.15 its own length ........................................................... A. albicornis Scherrer et Santos, sp. nov.

- Female flagellum with white band covering about 15 flagellomeres ( Figs 1 , 2 ). Supra-antennal area with a black horn ( Fig. 8 ). Orbital band fully absent ( Fig. 2 ). Propodeum with anterior transverse carina centrally distinctly arched forwards ( Fig. 2 ). Crossvein 1cu-a opposite to vein 1M+Rs ( Figs 1 , 2 )............................................................. .................................................................................................................. A. circumflexus Scherrer et Santos, sp. nov.

Figures

FIGURE 1. Acorystus circumflexus sp. nov., holotype Ψ, habitus. Photographed by Berthil B. Longo.

FIGURES 12, 13. Acorystus fulvus Townes, Holotype Ψ. 12, Left side. 13, Head and mesosoma, dorsal. Photographed by David B. Wahl.

FIGURES 4 – 11. 4 – 7, Acorystus albicornis sp. nov. 4, Holotype Ψ, head, dorsal; ob, orbital band. 5, Paratype Ψ, head, frontal. 6, Holotype Ψ, metapleuron, propodeum and first metasomal tergite, lateral. 7, Holotype Ψ, ovipositor tip, lateral. 8 – 11, A. circumflexus sp. nov., holotype Ψ. 8, Head, dorsal. 9, Head, frontal. 10, Metapleuron, propodeum and first metasomal tergite, lateral. 11, Ovipositor tip, lateral. Illustrations not to scale. All illustrations, except 5 and 9, photographed by Berthil B. Longo.

FIGURES 2, 3. 2, Acorystus circumflexus sp. nov., holotype Ψ, dorsal. 3, A. albicornis sp. nov., holotype Ψ, dorsal. Illustrations not to scale. Photographed by Berthil B. Longo.