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others, but above all the admirable "Researches of M. Lacaze Duthiers," we shall greatly extend our knowledge, not only of the sting of the Honey Bee, but of the correlated terminal pieces, such as ovipositors, saws, etc., with which the insects in the whole order Hymenoptera, are furnished. Having, at great expenditure of time, consulted all these and many other works, we may come back to our slide containing the dissected sting, and still find an inexplicable mystery in some of its parts. This has been my experience, and with a view of determining more accurately the entire mechanism of this intricate and complicated structure, I have carefully observed its action, so far as possible in the living insect, and by numerous dissections, in which I have traced every point of connection of the various pieces, and tested every possible movement of the parts upon each other, and made transverse sections through every point in its entire length, and I now venture to place before you the result of my investigations.

I have chosen the sting of the Honey Bee as the subject of

DESCRIPTION OF PLATES I AND II.

The figures in the two plates are numbered consecutively.

The description of one side applies to both.

Fig. 1. View of entire mechanism of the sting, except poison gland; muscles

being removed.

A, The sheath.

E, Palpi, or feelers.

D, Principal levers for projecting the sheath.

C, Articulated to D, at o, and slightly to B at i, affords muscular attachments to the compound lever composed of C and B.

B, Second part of this compound lever, articulated to D at s, and to the extremity of the lancet at c.

P, Neck of the poison gland: c, a, k, lancet.

Fig. 2. Lateral view of the same parts, with lancets removed to show the form of sheath; p, poison gland; d, duct leading from the secretory gland (not shown in the figure). The parts shown are lettered the same as in Fig. 1.

Fig. 3. Sheath with lancets lying along the grooves; levers removed to allow view of stop-valve attached to lancets, seen through the partially transparent cylindrical part at p ; a, anterior curved arm of sheath; f, "fourchette," below neck of poison gland.

Fig. 4. A single lancet dissected, to show its attachments. From a to c, a thin flange along the arched part; P, stop-valve appendage; B, triangular piece of compound lever-moving lancet, with which it is articulated at c.

Recherches Sur L'Armure Genitale des Insects. Par. M. Lacaze Duthiers. Annales des Sciences Naturelles. 1848 to 1852.

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