Species of Bibionidae from Baltic amber are reevaluated based on newly discovered material, and a key to the species is given. Bibio succineussp. nov. is described based on one male specimen, this is the first Bibio named from Baltic amber. The males of Hesperinus electrus Skartveit, 2009 and Penthetria montanaregis Skartveit, 2009 are redescribed. A single, autoclave treated specimen of Penthetria sp. is described but not formally named. Plecia tenuicornis Skartveit, 2009 is found to be a synonym of Plecia hoffeinsorum Skartveit, 2009, this species is recorded for the first time from Rovno amber, and both sexes of the species redescribed. Additional specimens of Plecia clavifemur Skartveit, 2009 and Dilophus crassicornis Skartveit, 2009 are described. Two female specimens probably belonging to the species discussed as Dilophus sp. by Skartveit (2009) are described, but not formally named.

中文翻译：

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Bibio属的一种新化石物种，其中包括来自波罗的海和罗夫诺琥珀（Biptera，Bibion​​idae）的双足类蝇的更新。

根据新发现的材料对来自波罗的海琥珀的Bibion​​idae物种进行了重新评估，并给出了该物种的关键。Bibio succineussp。十一月 是根据一个男性标本进行描述的，这是第一个由波罗的海琥珀命名的Bibio。重新描述了Hesperinuslectrus Skartveit（2009年）和Penthetria montanaregis Skartveit（2009年）的雄性。单个经过高压灭菌处理的Penthetria sp。标本。描述但未正式命名。Plecia tenuicornis Skartveit，2009被发现是Plecia hoffeinsorum Skartveit，2009的同义词，该物种是第一次从Rovno琥珀中记录下来，并且重新描述了该物种的两性。描述了2009年的Plecia clavifemur Skartveit和2009年的Dilophus crassicornis Skartveit的其他标本。两个雌性标本可能属于讨论的物种Dilophus sp.。