I went down to Sulphur, OK last fall and found 3 under one rock and no professional arachnologist has been able to key them to species yet! The three of them did well and have provided many in the arachnoculturist community with little ones- it's just that no one knows what species of Scytodes they are!
Well, seems every time I read about spiders, the opening paragraph talks about the low percentage of described species. So, you'd think it wouldn't that far fetched for you to have discovered an undescribed specie!
well, the fact that nobody is able to ID them to speciesleel doesn´t make in a new species...
If you take a look at WSC there´re 2 species described for the USA:
Scytodes poenitens & S. zapatana.
But that doesn´t mean that other described species can´t occur in the USA - they´re just not described from there.
well I guess they´re pretty small and hard to find... I´ve found those two only because they were sitting on a white wall. S. thoracica has a BL of less than 1cm.
I don´t know if Scytodes sp. occurs in your area but the fact that you haven´t seen one so far doesn´t say anything.