Forum Entomologi Italiani

Biblio. : Zhelokhovtsev in Medvedev (Ed.). 1988. Keys to the insects of the European part of the USSR. III. Hymenoptera. Part 6 Symphyta , Translation in English : Edit. E.J. Brill 1994
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Saluti,

# 2027 ♂ & 2026 ♀ captured in Cne : Lalande-en-Son (Dépt. Oise - France) - 08.08.1988
This ♂ & ♀ were captured at the same time and at the same place.
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The ♂ of melanochroa and dimidiata can be difficult to differentiate, because the only undeniable criterion is the form of the base of the clypeus (But I have not the binocular magnifying glass necessary) , I am not convinced that the color of legs and wings is enough !
Zhelokhovtsev adds a criterion : "Antennae in male equal to costal vein from tegula to stigma (dimidiata) - shorter (melanochroa)" . It is this criterion (In addition with the color of the legs and the captures of the ♂ & ♀ at the same place and at the same time) which I used.

Arge melanochroa ♂ & ♀ , Questa specie è stata catturata anche in Italia

Ciao.
D & JP Balmer