Requested reference
Levi, H. W. (1959c). The spider genus Latrodectus (Araneae, Theridiidae). Transactions of the American Microscopical Society 78(1): 7-43. doi:10.2307/3223799 
-- Show included taxa
Levi, H. W. (1959c). The spider genus Latrodectus (Araneae, Theridiidae). Transactions of the American Microscopical Society 78(1): 7-43. doi:10.2307/3223799 -- Show included taxa