The web of L. marginata [(fig. 318)] is in the form of a dome four or five inches in diameter, hung between rocks and plants, seldom much concealed by leaves. The threads are fine, and the web so transparent that it easily escapes notice unless the sun shines upon it. The meshes are larger than in L. phrygiana and other flat web-making species. The depth and width of the dome depend somewhat on the shape of the opening in which it is made, and the number and length of the supporting threads vary according to the surroundings. The spider stands apparently all the time under the top of the dome. Insects flying near touch the threads above the dome and, their flight being broken, drop down among closer threads and, finally, to the dome itself, where they are caught by the spider and taken through the meshes. Remains of insects and other rubbish are cut loose from the web and dropped. The webs seem to be used for a long time, but if they are injured a new one is soon made, either in the night or day, and the remains of several old webs are often seen hanging flat and torn below a new one. The dome is begun at the top and extended downward by inclined threads, an inch or two long, which are crossed by shorter threads in all directions [(fig. 321)]. The spider works very rapidly, but I have never seen a dome finished, the spider always working a few minutes and then resting a long time.

Linyphia communis.—A little smaller than marginata, with legs a little shorter. The colors are the same light yellow and purplish brown, but the markings are distinctly different. The cephalothorax is uniform light brownish yellow. The middle stripe of the abdomen extends the whole length of the upper side and connects with several narrow brown stripes that extend down the sides [(fig. 323)]. The abdomen is more regularly oval and less enlarged behind than in marginata, but the upper part extends back farther over the spinnerets. The under side is dark brown. The male is smaller than the female, with the head higher and the abdomen narrower. The palpi of the male are unusually small for the genus [(fig. 324)]. The web of communis [(fig. 322)] consists of a horizontal sheet, convex below and supported by threads above. Below this, about an inch distant, is another sheet of web. Insects flying between the upper threads fall down to the sheet below and are taken through by the spider, as they are in the dome of marginata.