. The common spiders of the United States. Spiders. Fig. 4gi. Fresh part of the web of Amaurobius sylvestris. oval, widest behind, and usually as long as the cephalothorax or longer. The legs are not more than a fourth longer than the body, and slender for so large a spider. The cephalotho- rax is dark brown, darkest in front, and the legs are a little lighter brown, without markings. The abdomen is gray, with a double row of oblique yellow or white markings on the hinder half and two curved marks of the same color on the front. These spots sometimes run together, so that the whole middle of t
. The common spiders of the United States. Spiders. Fig. 4gi. Fresh part of the web of Amaurobius sylvestris. oval, widest behind, and usually as long as the cephalothorax or longer. The legs are not more than a fourth longer than the body, and slender for so large a spider. The cephalotho- rax is dark brown, darkest in front, and the legs are a little lighter brown, without markings. The abdomen is gray, with a double row of oblique yellow or white markings on the hinder half and two curved marks of the same color on the front. These spots sometimes run together, so that the whole middle of the abdomen is light colored. The males have the head narrower and the thorax wider and all the legs longer than the female, and the cephalothorax and mandibles are not so dark colored. The male palpi have the patella as short as wide, and the tibia very short and wide, with a short hook on the outer and a longer and more slender one on the inner side, as shown in fig. 490. The epigynum has a small middle lobe inclosed by two lateral lobes that meet behind, and by this the female can be distinguished from the next species, — Amaurobius fcrox. The cribellum (fig. 469) is some- times covered by a fold of the skin, so that it is not readily seen. The cala- mistrum (fig. 470) is a close row of curved hairs on the upper side of the fourth metatarsus, about half its length. In the male the cribellum is rudimentary, and there is no calamistrum. This spider makes a large loose web under stones and sticks (fig. 488). In the parts freshly made the loose bands of silk can be seen running irregularly about on the other threads (fig. 491).. Fig. 492. Tibial joint of male .\maurobius ferox for com- parison with that of Amau- robius sylvestris (fig. 490).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Emerton, J. H. (Ja
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectspiders, bookyear1902
