body length of female 15-26 mm, of male, 7-13 mm
Brownish to gray with few white marks, dark W-shaped marks on dorsal surface of abdomen.
The main difference between scriptus and tenebrosus is that the 'W' pattern on scriptus is outlined in white all the way across the abdomen. The pattern in tenebrosus is broken.. and it generally has less white. It also appears that scriptus has a fuller and more complete median carapace stripe.
Additionally Dolomedes tenebrosus
features an inverted "v shaped" black mark beginning at the AME extending to the edge of the clypeus enclosing a light spot on the anteromedial margin compared to Dolomedes scriptus
which is dark only around each eye with a homogenous medium gray clypeus(1)
Eastern North America: southeastern Canada south to Florida, west to North Dakota, Texas.
Bushes, rocks, etc., near permanent bodies of water, sometimes in dry woodlands.
A youtube video of the male and female mating can be seen here
A study by Schwartz, Wagner & Hebets, August 2013, has found that during mating the male of this species dies. The paper can be found here
Howell and Jenkins, pp. 224-225, fig. 137 (2)
Kaston, p. 179, fig. 451 (3)
The Neartic Species of the Genus Dolomedes (Araneae: Pisauridae)(1)