瘦魔蜂属（Leptephialtites Rasnitsyn, 1975）是哈萨克斯坦晚侏罗世卡拉套生物群中魔蜂科魔蜂亚科的一个分异度比较高的类群，也曾报道于我国内蒙古宁城地区中-晚侏罗世道虎沟生物群，但没有描述和图示。本文对产自宁城道虎沟村中-上侏罗统道虎沟化石层的一块雌蜂标本进行了描述，将其归入瘦魔蜂属并建立了一新种：张氏瘦魔蜂（Leptephialtites zhangi Ding and Zhang, sp. nov.）。该新种区别于卡拉套生物群中瘦魔蜂属的所有种：前翅1-Rs脉长为其与翅痣基部距离之半（后者1-Rs脉不长于其与翅痣基部的距离），横脉1rrs完整（或者1rrs残存或完全消失）；腹部纺锤状，最宽处在其中部（后者腹部最宽处位于其端半部）。本文还提供了瘦魔蜂属所有已知种的检索表。另外，瘦魔蜂属仅存在于卡拉套生物群和道虎沟生物群，证实了这两个生物群具有密切的关系。

Leptephialtites Rasnitsyn, 1975 is a diverse wasp genus of the subfamily Ephialtitinae (Ephialtitidae) in the Late Jurassic Karatau Biota from Karatau, southern Kazakhstan. It was also reported from the Middle-Late Jurassic Daohugou Biota in Ningcheng, northeastern China but no descriptions and figures had been provided. Herein, a new species is established and assigned to this genus as Leptephialtites zhangi Ding and Zhang, sp. nov. based on a female wasp from the Middle-Upper Jurassic Daohugou Beds at Daohugou Village, Wuhua Town, Ningcheng County, Chifeng City, Inner Mongolia, China. The new species shows some differences from the Karatau species in having a forewing with 1-Rs about half length of its distance to pterostigma (vs. at most as long as its distance to pterostigma) and 1r-rs complete (vs. rudimentary or completely absent), and a spindle-like metasoma broadest medially (vs. broadest in rear half). Furthermore, a key to the species of Leptephialtites is provided. Occurrence of the genus Leptephialtites in both the Karatau and Daohugou biotas confirms the close relationship between the two biotas.

中国科学院战略性先导专项(B 类) (XDB26000000)和国家自然科学基金(42125201, 42288201)