1969 ] 
Levi — Theridiid Spiders 
73 
That the western form of L. variolus is the same as that of the 
east and southeast has to be assumed until we have contrary evidence 
based on modern species concepts. Such evidence might be significant 
morphological difference combined with differences in habits without 
intermediates by two populations separated geographically indicating 
reproductive isolation. This has not been found. Or better evidence 
might be the presence of two allopatric species with a region of 
overlap, in which two noninterbreeding populations can be found 
side by side. This also has not yet been demonstrated. 
