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Family Dipluridae

Spider - Euagrus chisoseus Spider - Euagrus chisoseus spider with big time Mygalomorph Mygalomorph Mygalomorph Dipluridae? - Euagrus chisoseus - female from SWRS - Euagrus chisoseus - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Mygalomorphae (Mygalomorphs)
Family Dipluridae
2 genera in BugGuide's range (North America north of Mexico)
3.5-17mm in body length (Microhexura spp. are pretty small, Euagrus spp. are larger)(1)
Long spinnerets for a mygalomorph.
Euagrus chisoseus: southeastern Arizona and adjacent northeastern Sonora east to southcentral Texas.(2)
Euagrus comstocki: along the lower Rio Grande River in extreme southern Texas.(2)
Euagrus rothi: known only from the Baboquivari Mountains in extreme southern Arizona.(2)
Microhexura idahoana: Cascade Mountains, Blue Mountains, and northern Rocky Mountains of Washington, Oregon, Idaho, and Montana.(3)
Microhexura montivaga: higher mountain peaks of the southern Blue Ridge Province in western North Carolina and eastern Tennessee.(3)
Ground-based webs under objects or in soft organic substrates.
Microhexura montivaga, the "Spruce-fir moss spider," is an endangered/protected species and is also the world's smallest mygalomorph!
Print References
Coyle, Frederick A., 1981. The mygalomorph spider genus Microhexura (Araneae, Dipluridae). Bulletin American Museum of Natural History 170: 64-75. (download available here)

Coyle, Frederick A., 1988. A revision of the American funnel-web mygalomorph spider genus Euagrus (Araneae, Dipluridae). Bulletin American Museum of Natural History 187: 203-292. (download available here)

Ubick et al., 2005. Spiders of North America: an Identification Manual. American Arachnological Society, Keene (New Hampshire). 377 pages.
Works Cited
1.Spiders of North America: An Identification Manual
D. Ubick, P. Paquin, P.E. Cushing and V. Roth (eds). 2005. American Arachnological Society.
2.A revision of the American funnel-web mygalomorph spider genus Euagrus (Araneae, Dipluridae)
Frederick A. Coyle. 1988. Bulletin of the American Museum of Natural History 187(3): 203-292.
3.The mygalomorph spider genus Microhexura (Araneae, Dipluridae)
Frederick A. Coyle. 1981. Bulletin American Museum of Natural History 170: 64-75.