Trachionus Genus-Group

Zheng, Min-Lin, Achterberg, Cornelis van & Chen, Jia-Hua, 2016, A new species of the genus Proantrusa Tobias (Hymenoptera: Braconidae: Alysiinae) from northwestern China, Florida Entomologist 99 (3), pp. 385-388 : 386-387

Key to the Genera of Trachionus Genus-Group

1.— Metanotum distinctly and acutely protruding dorsally ( Fig. 6 ); vein 1-SR of fore wing 7–10 times as long as its minimum width ( Fig. 3 ), but up to 4 times in Proantrusa ; combined length of 2nd and 3rd metasomal tergites 0.4–0.8 times total length of metasoma ( Fig. 9 ); pronope absent; Trachionus Haliday, 1833 s.l.................................................................................. 2

1’.— Metanotum not or slightly protruding dorsally; vein 1-SR of fore wing medium-sized to short, less than 5 times as long as wide; combined length of 2nd and 3rd tergites 0.3–0.5 times total length of metasoma; pronope variable........ other genera of Alysiinae-Dacnusini 2.— Third to 5th metasomal tergites of ♀ sculptured; 2nd tooth of mandible obtuse, lobe-shaped............ Parasymphya Tobias, 1998

2’.— Third to 5th tergites of ♀ smooth ( Fig. 8 ); 2nd tooth of mandible acute, triangular ( Fig. 2 )...................................... 3

3.— Frons with small median tooth in front of anterior ocellus ( Fig. 2 ); length of 2nd and 3rd metasomal tergites of ♀ 0.4 times total length of metasoma................................................................................... Proantrusa Tobias, 1998

3’.— Frons without small median tooth in front of anterior ocellus; length of 2nd and 3rd metasomal tergites of ♀ 0.6–0.8 times total length of metasoma................................................................................. Trachionus Haliday, 1833 Syn. : Aenone Haliday, 1838 (not Lamarck, 1818); Oenone Haliday, 1839 (not Lamarck, 1818); Symphya Foerster, 1863 ; Anarmus Ruthe in Brischke, 1882; Planiricus Perepechayenko, 2000 (subgenus).

Figures

Figs. 1–9. Proantrusa tridentata sp. nov., female, holotype. 1, Head (frontal view); 2, head (dorsal view); 3, forewing; 4, hind tarsus;5, mesosoma (dorsal aspect); 6, mesosoma (lateral aspect); 7, propodeum; 8, metasoma (dorsal view with T1–4 visible); 9, metasoma (lateral aspect).