Advertisement Uroctonus mordax (Vaejovidae) Size: Adult female, aprox. 2 inches. I was insect and arachnid collecting in coastal forests of northern California. Among various arthropod specimens collected was a single female U. mordax. I handled her when doing maintenance in the enclosure. While handling I tried to coax her back into the enclosure by slightly tapping the segment below the telson. She defensively threw the telson back into the side of my thumb. The symptoms were itching and slight redness of the sting area for about 2 days. Alex S.