Requested reference
Ubick, D. & Roth, V. D. (1973a). Nearctic Gnaphosidae including species from adjacent Mexican states. American Arachnology 9(suppl. 2): 1-12. 
-- Show included taxa
Ubick, D. & Roth, V. D. (1973a). Nearctic Gnaphosidae including species from adjacent Mexican states. American Arachnology 9(suppl. 2): 1-12. -- Show included taxa