Pion

Watanabe, Kyohei, 2016, First record of the genus Pion Schiødte, 1839 (Hymenoptera: Ichneumonidae: Ctenopelmatinae), from Japan, with description of a new species, Zootaxa 4103 (3), pp. 289-294 : 293-294

Key to world species* of the genus Pion

* P. interstitialis Constantineanu & Constantineanu, 1970 , and P. schenkii (Jaennicke, 1867) are not included because there is little useful information for identification in their original descriptions and I could not be examine the types or determined specimens.

1. Hind femur black in both sexes. Face black in male. Apex of metasoma red in female. Lateromedian longitudinal carina of propodeum parallel. Western Palaearctic region...................................... ... Pion nigripes Schiødte, 1839

-. Hind femur various in colouration. Face yellow in male ( Fig. 10 ). Apex of metasoma red or black ( Figs 8–10 ). Lateromedian longitudinal carina of propodeum parallel or convergent anteriorly............................................... 2

2. Lateromedian longitudinal carina of propodeum distinctly convergent anteriorly. The spiracle of T1 situated at basal 0.5 in female.............................................................................................. 3

-. Lateromedian longitudinal carina of propodeum parallel ( Fig. 2 ) or nearly so. The spiracle of T1 situated at basal 0.4 in female.................................................................................................... 4

3. Hind femur entirely red in female, reddish-yellow to yellow with black base and apex in male. Oriental region (Southern part of China).................................................................... .. Pion yifengensis Sheng, 2011

-. Hind femur red with black base and apex. Male unknown. Western Palaearctic region.......... Pion stammeri Bauer, 1958

4. T2-T7 (or sometimes posterior part of T1) red and apex of metasoma red. Hind femur reddish-brown. Hind tibia reddishbrown with black apex. Western Palaearctic region................................. Pion fortipes (Gravenhorst, 1829)

-. T2 (or sometimes posterior part of T1)-T4 (or sometimes T5) red and apex of metasoma black ( Figs 8, 9 ). Hind femur and tibia various in colouration. Eastern Palaearctic region............................................................ 5

5. Lateromedian longitudinal carina almost parallel but slightly convergent anteriorly in female. Malar space 0.5 times as long as basal width of mandible. Antenna with 30–34 flagellomeres. Hind femur black with a large red area in female. Hind tibia entirely black in female. Male unknown. Northern part of China............ Pion qinyuanensis Chen, Sheng & Mao, 1998

-. Lateromedian longitudinal carina completely parallel, not convergent anteriorly in female ( Fig. 2 ). Malar space 0.6 times as long as basal width of mandible in female. Antenna with 28–29 flagellomeres. Hind femur black in female (rarely tinged with red) ( Fig. 9 ), black with a ventral longitudinal stripe in male ( Fig. 10 ). Hind tibia yellowish-brown basally, black apically in female ( Fig. 9 ). Japan....................................................... Pion japonicum Watanabe sp. nov.

Figures

FIGURES 8 – 10. Pion japonicum sp. nov. 8, female (holotype), dorsal habitus; 9, female (paratype), lateral habitus; 10, male (paratype), lateral habitus. Scale bar: 2.0 mm.

FIGURES 1 – 7. Pion japonicum sp. nov., 1 – 3, female (holotype): 4 – 7, male (paratype). 1, head, frontal view, surface sculptures omitted except for left half of clypeus; 2, propodeum, dorsal view, surface sculptures omitted except for left half of dorsal face; 3, T 1, dorsal view; 4, subgenital plate, ventral view; 5, 6, genital capsule, dorsal (5) and ventral (6) view; 7, right aedeagus, lateral view.