$Cyclosa conica$ or $caudata.$--This spider may be known by the blunt conical hump at the hinder end of the abdomen, extending upward and backward over the spinnerets (figs. 428, 429). Full-grown females are about quarter of an inch long. The color is a mixture of gray and white, different individuals varying from almost white to almost black. The cephalothorax is longer than wide, the front part narrow, and the top of the front of the head extended forward beyond the base of the mandibles. The hump on the abdomen varies considerably in size, and is generally about half as long as the rest of the abdomen and slopes gradually into it. In light individuals the markings of the abdomen are obscure, but usually there is a distinct dark middle stripe, widest near the base of the hump. The under side is black, with a pair of very distinct light spots across the middle. The cephalothorax is dark gray or black without stripes, sometimes a little lighter around the eyes. The legs are white, with dark rings at the end of each joint and in the middle of each except the femora. On the first and second femora the dark rings are very wide, covering sometimes more than half the joint. The males have the cephalothorax darker and narrower in front, and the abdomen smaller, with only a slight hump. The spider seems to live all the time in the web. The inner spiral is large and widens gradually from the center outward. There is usually a line of silk across the web, in which are fastened parts of dead insects and other rubbish and, in the middle of the summer, the cocoons of eggs. The spider, standing in the middle of this band where it crosses the center of the web, looks like part of the rubbish. When an old web is torn down this band of rubbish is left in place, and the new web made across it. A peculiarity of the web of this spider is that the inner spiral has one, and sometimes two, loops in it, making it wider than it is high (fig. 430). [Illustration: FIG. 430. Half-finished web of young Cyclosa conica, showing sticks and rubbish across the lower half. The inner spiral has a loop in the left side.] THE THREE SPECIES OF THE GENUS ZILLA [Illustration: FIG. 431. Female Zilla atrica, enlarged four times.] [Illustration: FIG. 432. Middle of web of Zilla atrica with the open segment and thread to the nest at the left.]