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2. Tergite 5 without dusting at the dorsal anterior edge (sometimes present at the sides). Apical scutellar bristles usually strong, crossed. 1 st (seldom 0 or 2). Males : frons 0.50 - 0.69 x as wide as one eye ; 3rd antennal segment 2 - 3 x as wide as the 2nd (each measured in the centre). Females : dorsal hairs of tergite 5 as long as 1/3 - 1/2 of the discal bristles => T. lurida F.
− Tergite 5 at the anterior edge almost always with a narrow band of dusting. Crossed apical bristles missing as a rule, when present, then ± hair-like. As a rule, 2 or 3 st. Males : frons 0.24 - 0.43 x as wide as one eye ; 3rd antennal segment 1.2 - 1.8 x as wide as the 2nd. Females : dorsal hairs of tergite 5 as long as 2/3 - 5/6 of the discal bristles -> 3
3. Dorsal thoracic hairs pale yellow or whitish. Marginal bristles of tergite 4 as a rule shorter than the segment. Males : reddish side spot of the abdomen scarcely developed ; it usually ends at the posterior edge of tergite 4 or is sometimes missing altogether. Body length 9 - 16 mm => T. ursina Meig.
− Dorsal hairs of the thorax completely or predominantly black. Marginal bristles of tergite 4 longer than the segment. Males: reddish side spot of the abdomen more extensive; it includes tergite 5 also. Body length 7 - 11 mm => T. nigrohirta Stein
(It is not yet clear whether this form is an independent species or only a variant of ursina)
Je suis trop fatiguée pour y comprendre quelque chose et comprendre ce qu'il faudrait voir sur une vue du Q. Demain sera un autre jour.
Ajouté moins d'une heure après :
Catherine Reymonet : France : Peyrelevade : 19290 : 23/03/2024
Altitude : 801 m - Taille : 10 mm ? Réf. : 339234
Aime-toi, le ciel t’aimera... Despise not the weak : the gnat stings the eyes of the lion.