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Paul, you are right. Sundew can check this female:
3. Antenna yellow, only postpedicel somewhat darkened; apical section of CuA1 longer than basal section; 1.25-2.0 .......flaviventris (von Roser)
? Antenna entirely black; Apical section of CuA1 shorter than basal section; 1.5-2.5............................... molliculus (Fall?n)

Chrysotimus molliculus (Fallen, 1823) [Dolichopus] (Loew, 1857: Progr.Realsch.Meseritz 1857: 47-48; Schiner, 1862: Fauna austr. 1: 185) *
=Dolichopus molliculus Fallen, 1823: Dipt.Svec. 2 Monogr. Dolichopod. Svec.): 23 ** possible ST: MZLU, 5 males and 1 female in NHRS. Type locality: Ostrogothia [Sweden]. Palaearctic: Austria, Belgium, Bulgaria; Czech, Denmark, England, Finland, France, Georgia; Germany, Hungary, Ireland, Lithuania, Netherlands, Norway, Poland, Romania; Russia: Adygea, Karelia, Krasnodar, Leningrad, Moscow, Tula, Voronezh; Slovakia, Sweden, Switzerland; Ukraine: Kharkiv, Kherson * Chrysotimus