. The Cambridge natural history. Zoology. 328 ARACHNIDA ARANEAE. chelicera and the inner surface of the femur of the pedipalp were finely striated at the point, where they were rubbed together when the palps were agitated, but though the appropriate motion was frequently given, he could hear no sound. Meanwhile the noise produced by a large Thera- phosid spider in Assam {Chilobracliys stridulans) had attracted attention, and its stridulating appa- ratus was described in 1875 by Wood - Mason/ The sound resembled that ob- tained by â â drawing the back of a knife along the edge of a strong Fig.
. The Cambridge natural history. Zoology. 328 ARACHNIDA ARANEAE. chelicera and the inner surface of the femur of the pedipalp were finely striated at the point, where they were rubbed together when the palps were agitated, but though the appropriate motion was frequently given, he could hear no sound. Meanwhile the noise produced by a large Thera- phosid spider in Assam {Chilobracliys stridulans) had attracted attention, and its stridulating appa- ratus was described in 1875 by Wood - Mason/ The sound resembled that ob- tained by â â drawing the back of a knife along the edge of a strong Fig. 184. â Ohilobrachys stridulans in stridn- COniD. lating attitude. After Wood-Mason. Natural SubsCQUentlv Certain size. ^ â¢' Sicariid spiders of a genus confined to the southern hemisphere were heard to produce a sound like the buzzing of a bee by the agitation of their palps, and both sexes were found to possess a very perfect stridulating organ, consisting of a row of short teeth on the femur of tlie pedipalp, and a striated area on the paturon of the chelicera. Pocock has recently discovered that all the large kinds of Theraphosidae in the countries between India and New Zealand are, like Ohilobrachys, provided with a stridulating organ. In these spiders also it is between the palp and the chelicera, and consists of a row of teeth or spines constituting a "pecten," and a series of vibratile spines or " lyra," but whereas in Ohilobrachys and its near relations the lyra is on the palp and the pecten on the paturon, in other spiders the positions are reversed. The lyra is a very remarkable organ, consisting of club-shaped, often feathery bristles or spines, which lie parallel to the surface to which they are attached, and which is slightly excavated for their reception. Lastly, many African Theraphosids possess a similar organ, ' Proc. Asiat. Soc. Beng. 1875, p. Please note that these images are extracted from scanned page images that may have bee
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