File:The Journal of microscopy and natural science (1884) (14783682475).jpg

Identifier: journalofmicrosc03post (find matches)
Title: The Journal of microscopy and natural science
Year: 1884 (1880s)
Authors: Postal Microscopical Society Wesley Naturalists' Society Allen, Alfred
Subjects: Microscopy Microscopes
Publisher: (London : W. P. Collins
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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ete. But not quite ; for if so fortunate as to getseveral, you may have the opportunity of witnessing the union ofthe sexes (a very important point). The chapter may now beclosed. You will for some time have had a most interesting andinstructive study before you, and will be able to furnish a valuablepaper for the Transactions of our own Society, which I hopesome day to see published. Claws of Insects.—In Notonecta glauca we have a typicalillustration, and a most interesting one, of the truth that the clawsof all insects, whatever form they assume, are but modifications ofhairs !I to adapt them to special purposes. Leg of Dytiscus.—Dytiscus is a great predaceous Water-beetle ;the largest our country produces. To enable it to overcome thestruggles of its powerful partner in the slippery element, the maleshave the three proximal joints of the anterior tarsi greatly dilatedand furnished with sucking discs. The present specimen shows Journal of Microscopy, Vol. 3, PI. 7 ^ J^V-. >*,
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AT THE MICROSCOPE. 37 the under-surface of the right tarsus and tibia. By turning it over,the three joints, in which so unusual an enlargement has takenplace, may be well seen. A few thoughts on the arrangement ofthe suckers will not be without interest. We find, then, in thefirst place, two very large ones, the greatest size by far beingwith the inner one. On the joint bearing these are 40 more—i.e.,2x10x2:= 40; the second joint has also 40, 2x10x2, again;the third joint has 60—i.e., 2 x 10 x 3 = 60. The two distal tarsaljoints have nothing very special about them (as we say). Thelimbs of the second pair in the male Dytiscus are also furnishedwith a beautiful apparatus of sucking discs, the arrangement ofwhich, however, I have not counted. Tong^ue of RMiigia (PI. VII., Fig. 3).—This compares in-structively with that of Drone-fly, to be found in most cabinets.The proboscis is long, membranous, elbowed near the base, ter-minated by two large labial lobes (under lip), and enclosin

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