Forum Entomologi Italiani

Biblio.
- Chevin : Tenthredo succincta Lep. 1823, espèce valide .... in "Cahiers des Naturalistes Parisiens" 1983 - n.s. 39 - p.15/18

marginella (of Chevin) = thompsoni , succincta (of Chevin) = marginella

- Taeger : Zweiter Beitrag zur Systematik der Blattwespengattung Tenthredo (s.str.) in "Beitrag zur Entomologie" 1988 - 38(1) - p.103/153
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Saluti,

# 2938 ♂ Captured in Cne : Pontoise (Dépt. Val d' Oise - France) - 11.08.1994
# 3093 ♀ Captured in Cne : Pontoise (Dépt. Val d' Oise - France) - 14.08.1995

For the keys of determination of this sp., see : viewtopic.php?f=11&t=34877 & viewtopic.php?f=375&t=35433
See also thompsoni : viewtopic.php?f=11&t=35831
Therefore : marginella or thompsoni
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3093 ♀
According to Chevin, the punctuation of mesopleura is not easy to estimate.
The teeth of the saw are not very visible.
Thus how to identify this ♀ ?
- We calculated the criterion h/lg (see drawing) which shares our captures ♀ into 2 groups:

1st : h/lg ~ 0.20 (sp. thompsoni # 1571, alone ♀ that we were able to identify as such).
2nd : h/lg ~ 0.28 to 0.33 (All the others ♀).
Being given the weakness of our sample (and of our identifications ...), this criterion asks to be scientifically validated !

- The first captures of the 2nd group was all made, during the years, at the latest on August 14th, that is ≥ 3 weeks before the capture of the sp. thompsoni ♀.
- I thus think that the species of the 2nd group are marginella, in particular our ♀ # 3093.

But by caution we shall say : cf. marginella

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2938 ♂
Our ♂ has the mandibles (apex excepted) entirely brown-blackish.
It is thus a marginella.
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Finally :
Tenthredo (Tenthredo) marginella F. 1793 ♂ & ♀(cf.), Anche catturato in Italia.

Ciao,
D & JP Balmer

Thanks for the rectification in the title of the Message, [♀ (cf.), no ♀]
D & JP Balmer