. Economic entomology . Fabric of the web of the Ciniflonids. flocculous compound threads. These are very beautiful under the microscope. One straight line usually forms the foundation of the compound thread, and this is accompanied by several lines of extreme fineness, some of which are merely slack, while the rest are curled and twisted in every direction, by the operation of the spines forming the calamistrum. When newly spun, these threads have to the naked eye a bluish colour, but being very apt to en- tangle dust, the net is most fre- quently found in a foul and dis- coloured state. When
. Economic entomology . Fabric of the web of the Ciniflonids. flocculous compound threads. These are very beautiful under the microscope. One straight line usually forms the foundation of the compound thread, and this is accompanied by several lines of extreme fineness, some of which are merely slack, while the rest are curled and twisted in every direction, by the operation of the spines forming the calamistrum. When newly spun, these threads have to the naked eye a bluish colour, but being very apt to en- tangle dust, the net is most fre- quently found in a foul and dis- coloured state. When handled, it clings to the fingers with remark- able tenacity. This is said to arise from the structure, rather than from any peculiar viscidity of the thread. The bluish colour of the web has been already noticed, and viewed in the microscope with the help of the parabolic condenser, the com- pound thread appears to be enveloped in something like a bluish cloud or vapour. Whatever this substance may be, (and it is so transparent as easily to escape observation under even the most Calamistrum of Ciniflo (enlarged). Part of ditto (more magnified).
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondonchapmanandha
