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After a certain time used to prospect the documentation about Chironomus
I 'm now convinced that's very difficult to reach my intention: determinate with physical features the right name of this Chironomus pupa






A certain amount of details do match with Chironomus pupa, but when I consider more seriously the remnants of the larva, which is still attached by exuvie ... this leads to questions and very difficult comparisons that do not offer of a final solution.
Example: the larva Chironomus santicarolli could be similar in various details relating to the larva/pupa .. but Chironmus santicarolli lives in Brazil!
http://www.scielo...g01-07.jpg

What comes closest to Chironomus plumosus, described here with this reference

http://genetics.u.../Sppmp.htm
(from http://genetics.unimelb.edu.au/Martin/NACytfiles/NAChiron.html )
which could be acceptable.
However, when in doubt, I must content myself with the name
Chironomus spec, as suggested Atylotus, whom I thank.

Here are a view of the mouthparts of the larva related to this pupa





merci beaucoup
SDS