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Genus Callilepis

Spider on the steps seeks ID - Callilepis Spider on the steps seeks ID - Callilepis C. imbecilla - angled ventral palp - Callilepis imbecilla - male Callilepis pluto Gnaphosid - Callilepis pluto Is this Gnaphosid a Callilepsis? - Callilepis imbecilla - male Callilepis pluto? - Callilepis spider unknown - Callilepis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Gnaphosidae (Ground Spiders)
Genus Callilepis
7 species in BugGuide's range (North America north of Mexico)
Body length 2.5-7mm(1)
The "translucent lamina on the cheliceral retromargin" (Dondale and Platnick, 1992), is a diagnostic feature for the genus Callilepis:
The following ranges are taken from a combination of (1), (2), & (3) (for quick reference, Canadian ranges are in bold):

Callilepis chisos: eastern Arizona, New Mexico, Colorado, and western Texas.
Callilepis eremella: western United States and southern British Columbia.
Callilepis gertschi: southwestern United States (e.g. AZ, NM, TX).
Callilepis gosoga: California and northern Baja California.
Callilepis imbecilla: Illinois and southernmost Ontario, south to Texas and Florida (no records for the northeastern states).
Callilepis mumai: southwestern United States from Utah south to Mexico (e.g. UT, AZ, NM).
Callilepis pluto: western Northwest Territories to Maine, south to Oregon, Colorado and Alabama (Canadian portion includes NT, BC, AB, SK, MB, ON, QC, & NS(3)).
Dry places such as rocky hillsides, quarries, and sandy beaches. They use surface debris as daytime shelter.(1)
Internet References - Callilepis pluto female.
The Kansas School Naturalist vol. 55, 2007 - two images of female Callilepis imbecilla (scroll to color photo section)
Works Cited
1.Insects and Arachnids of Canada Part 19: The ground spiders of Canada and Alaska : Araneae: Gnaphosidae
Norman Platnick & Charles Dondale. 1992. Research Branch, Agriculture Canada, Publ. 1875: 1-297.
2.A revision of the Holarctic spider genus Callilepis (Araneae, Gnaphosidae)
Norman Platnick. 1975. American Museum Novitates 2573:1-32.
3.Checklist of the spiders (Araneae) of Canada and Alaska
Paquin, Buckle, Duperre, & Dondale. 2010. Zootaxa 2461: 1–170.