Strongylogaster species

Macek, Jan, 2010, Taxonomy, distribution and biology of selected European Dinax, Strongylogaster and Taxonus species (Hymenoptera: Symphyta), Acta Entomologica Musei Nationalis Pragae 50 (1), pp. 253-271 : 263-264

Key to adults of Strongylogaster species in the Czech Republic

1 Tarsal claws simple. .................................................................................................... 2

– Tarsal claws with small ventral denticle. .................................................................... 4

2(1) Clypeus and labrum black. ............................................. S. mixta (Klug, 1817) ( Fig.4 )

– Clypeus and labrum pale. ............................................................................................ 3

3(2) Ground colour of abdomen predominantly orange yellow; orange-yellow pattern more or less confluent with yellow spots on laterotergites; abdomen of male extensively orange yellow. ........................................................................ S. macula (Klug, 1817) ( Fig. 2 )

– Ground colour of abdomen predominantly black, dorsal orange yellow pattern confined to middle of abdominal terga, not confluent with white spots on laterotergites; abdomen of male almost entirely black with white laterotergites. .... S. baikalensis Naito, 1990 ( Fig. 3 )

4(1) Anal cell of fore wings with crossvein; labrum yellow; ovipositor sheaths tapering towards apex. ................................................................ S. filicis (Klug, 1817) ( Fig. 5 )

– Anal cell of fore wings simple; labrum black, ovipositor sheaths diverging towards apex. ............................................................................................................................ 5

5(4) Flagellum black, last sternum with deep median incision (females); last sternum always red, abdomen except tergite 1 and 2 red (males). .......................................................... .................................................................... S. multifasciata (Geoffroy, 1785) ( Fig. 6 )

– Flagellum yellow to reddish, last sternum feebly inflexed posteriorly (females); last sternum mostly black, abdomen with more or less extensive black pattern (males). .... ...................................................................... S. xanthocera (Stephens, 1835) ( Fig. 7 )

Figures

Figs. 2–7. Strongylogaster Dahlbom, 1835, adults: 2 – S. macula (Klug, 1817); 3 – S. baikalensis Naito, 1990; 4 – S. mixta (Klug, 1817); 5 – S. filicis (Klug, 1817); 6 – S. multifasciata (Geoffroy, 1785); 7 – S. xanthocera (Stephens, 1835). Scale: 10 mm.