The Common Spiders of the United StatesEmerton, J. H. (James Henry)
Science
The Common Spiders of the United States
Emerton, J. H. (James Henry)
Spiders -- United States
[Illustration: FIGS. 181, 182. Lycosa communis.--181, female enlarged
three times. 182, front of head showing eyes.]
$Lycosa communis.$--This is a common spider in pastures, running in
grass or hiding under stones. It varies in color from light gray to
almost black, but the markings are almost always the same and distinct.
On the thorax there is a middle stripe extending forward to the eyes,
and a narrower one between the eyes to the front of the head (fig. 181).
At the sides are light stripes nearly as wide as the middle one
extending under the eyes to the front of the head. On the abdomen the
front pointed stripe is large. The light stripes at the side of it are
wide and distinct, uniting on the hinder half of the abdomen into a
middle stripe, broken sometimes into a row of four or five spots. In
dark individuals this light marking is yellow and more strongly defined
than in lighter ones. On the thorax, especially in light
colored-spiders, there are usually two or three light marks radiating
from the dorsal groove. The legs, except the ends of the first and
second, are marked with rings at the ends and middle of the joints,
indistinct in light spiders and brighter in dark ones.
The length is two-fifths to half an inch. The legs are long, the fourth
pair three-quarters of an inch in length. The second row of eyes is a
little wider than the first, and the second eyes are large and their
diameter apart (fig. 182). On the under side of the abdomen are two dark
stripes meeting at the spinnerets so as to form a horseshoe-shaped
figure, but in some very dark individuals the whole under side of the
abdomen behind the epigynum is dark colored. There is little difference
between the sexes. The females carry eggs in June and July.
[Illustration: FIG. 183. Lycosa scutulata.--Female enlarged twice.]
$Lycosa scutulata.$--This is a large and well-marked species, over half
an inch in length and with hind legs over an inch long (fig. 183). The
legs are yellowish gray without markings. The cephalothorax is dark
gray, with a light middle stripe and one on each side extending under
the eyes to the front of the head. There is also a narrow light line on
the edge of the thorax at the sides. In the middle of the abdomen is a
dark stripe, with five or six pairs of light spots, those of the front
pair being only partly inclosed by the stripe. At the sides of the
middle stripe are narrower light bands, and beyond these fine light and
dark oblique lines. On the under side the whole body is light gray.
In the males the front legs are a little longer and much darker colored
than the others. The male palpi are slender, and the tarsi small for so
large a spider. The second row of eyes is a little wider than the front
row.
[Illustration: FIGS. 184, 185. Lycosa ocreata.--184, female enlarged
eight times. 185, cephalothorax and front legs of male.]
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