Chrysis with mesonotum medially almost black

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Chrysis with mesonotum medially almost black

Postby EMMERY » 11 Nov 2020 18:25

Hello,
I observed this Chrysis of 9 mm on 18 July 2020 at an altitude of 1145 m on the trail that goes from Casset to Le Bourg on a sunny slope (La Chapelle-en-Valgaudemar, Hautes-Alpes FR05). I noticed that the middle part of the mesonotum is almost black and the apical rim of T3 is dark blue-purple. Could it be Chrysis graelsii ?
Thanks ! Best regards.
Brigitte Emmery


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Re: Chrysis with mesonotum medially almost black

Postby Alex » 12 Nov 2020 21:08

this should be Chrysis analis, perhaps it is not usually this dark, but chrysidids often become darker with higher altitude (or latitude for that matter)
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Re: Chrysis with mesonotum medially almost black

Postby EMMERY » 13 Nov 2020 19:26

Thank you for your reply.
What are the criteria differentiating Chrysis analis from Chrysis graelsii?
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Re: Chrysis with mesonotum medially almost black

Postby jeromec » 10 Dec 2020 15:50

Chrysis analis (& simplonica) have a smaller transversal frontal carina than graelsi (& valesiana) ;
malar space is inexistant in graelsi (small but distinct in analis & simplonica) ;
an other criterium is the lenght of 1st & 2nd flagellomeres ; (F I is longer in analis than in graelsii if I remember).
puncture of tergum II is different ; analis is more slender than graelsii.

Chrysis analis is commoner (in my region Franche-Comté, east of France), on dry calcarous grassland, end-may to july.
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Re: Chrysis with mesonotum medially almost black

Postby EMMERY » 03 Jan 2021 11:55

Un grand merci pour ces précisions qui me permettent d'avancer dans la détermination. Et je vous souhaite une très belle année 2021 !
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