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Got a decent series of this Beameromyia below Marshall Gulch on Mount Lemmon in the Santa Catalina mountains. Saw one displaying by bouncing in the air, the others were found by sweeping shin-high grasses or on twigs. I think they key out to B. occidentis in Martin 1957 (especially with the male showing the “C” shape). Interesting how this species has an apical swelling and upturn on the abdomen (especially visible in the male) kinda like Leptopteromyia. Specimens in collection (ethanol and pinned).

Single individual observed feeding on wing membrane of Corynorhinus townsendii, in mine shaft, roughly 10m from entrance. Five bats were observed in the mine, though only this individual had a Trichobius. Based on the host, this is most likely Trichobius corynorhinus.

Members of the subfamily Coniopteryginae are recognized by the presence of only one r-m crossvein in the middle of the wing. Two genera can be found in Arizona, Semidalis and Coniopteryx, and these may be further separated by the position of the m-cu crossvein (see second pic, highlighted red); in Coniopteryx this crossvein is located anterior to the branching of vein m, whereas in Semidalis this crossvein emerges behind the fork on vein m3+4. Four Semidalis and four Coniopteryx species are known from southern Arizona.

Length ~7mm. Tip of conductor very slender and sharply angled. Lateral eyes closer together than median eyes. Chelicerae shorter than carapace. Had crawled onto bow of skiff from beach grasses next to hemlock/spruce forest.