Siobla annulicornis

Niu, Gengyun & Wei, Meicai, 2010, Revision of the Siobla annulicornis, acutiscutella and sheni groups (Hymenoptera: Tenthredinidae), Zootaxa 2643, pp. 45-65 : 51

Key to species of the annulicornis group

1 4th to 7th antennomeres yellow brown; pronotum black; hind trochanter, fore and middle femur largely, basal 2/5 (female) or 2/3 (male) of hind femur, all tibiae and tarsi in female, fore and middle tibiae and tarsi, hind tarsi, basal 2/3 of hind tibia in male, 2nd to 4th abdominal tergites, yellow brown; abdominal tergites without blue luster; forewings weakly but distinctly infuscate at apex, stigma yellow brown; interspaces of punctures on temple hardly shiny (Figs.3e, f); malar space as long as radius of ocellus; lateral furrows of postocellar area strongly divergent posteriorly; middle fovea large and shallow (Figs.3e, f); ventral margin of sheath angularly bent near apex (Fig.3h)............ .................................................................................................................................................. S. annulicornis sp. nov.

- 5th and 6th antennomeres partly white; broad posterior margin of pronotum reddish brown; most of fore femur, middle and hind legs entirely black; most of 2nd abdominal tergite, 2nd to 5th abdominal sternites, yellow brown; 3rd to 8th abdominal tergites with feebly blue metallic luster; wings hyaline, stigma dark brown; interspaces of punctures on temple distinctly shiny (Fig.4e); malar space as long as diameter of ocellus; lateral furrows of postocellar area parallel posteriorly; middle fovea narrow and deep (Fig.4e); ventral margin of sheath roundly and evenly curved toward apex (Fig.4c) .................................................................................................................. S. leucocincta sp. nov.