Leptostigma n. gen.

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Figs. 3A–D, 3G–K, 5–21.

Type species. Leptostigma brevilatum n. sp.

Diagnosis. Distinguished from Cenocimbex by lacking dark triangular sclerite on R basal to pterostigma reaching 1-Rs+M near 1m-cu (absent or undetectable being small, pale); wing narrower (length/width 2.8 or more); cell 3rm long (2r-m to 3r-m distinctly longer than length of 3r-m); hind wing with cu-a well before middle of cell mcu; distinguished from Allenbycimbex by pterostigma narrow, maximum height about equal to height to C to R basal to pterostigma.

Species included. The type species and L. longiclava n. sp., L. longipallidum n. sp., L. longitenebricum n. sp., L. proxivena n. sp., L. fasciatum n. sp., and L. alaemacula n. sp.

Etymology. From the Greek leptos, meaning thin, and stigma, for the pterostigma. The name is neuter (see Examples below Art. 30.1.2, ICZN 1999).

Locality and age. Republic, Washington, United States of America, Tom Thumb Tuff Member of the Klondike Mountain Formation exposure A0307; and McAbee, British Columbia, Canada, Hoodoo Face beds; mid-Ypresian .