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Dermoids more deeply placed, such as those within the thorax, or those situated between the rectum and sacrum, give rise to difficulty in diagnosis, even with the help of the X-rays, and their nature is seldom recognised until the escape of the contents particularly hairs supplies the clue.
It is described and figured in "Harris's Treatise on Insects." Closely allied, though generally wingless, is that enemy of our peace, the bed-bug. It has a small somewhat triangular head, orbicular thorax, and large, round, flattened abdomen. It is generally wingless, having only two small wing-pads instead. The eggs are oval, white; the young escape by pushing off a lid at one end of the shell.
I should add that, to achieve success, we must have a subject with a concentrated ganglionic column, such as the Weevil, the Buprestis, the Dung-beetle and others. Paralysis is then obtained with but a single prick, made at the point which the Cerceris has revealed to us, the point at which the corselet joins the rest of the thorax.
The larva is very active in its habits, being provided with six legs, attached to the thorax, on the back of which are the little wing-pads, or rudimentary wings.
The best is a sort of cerecloth which he prepares specially with a very fine material. It possesses the advantage that it can be softened at the bowl of one's pipe when the time comes to operate out of doors. I cut out of this cerecloth a small square the size of the Bee's thorax; and I insert the magnetised point through a few threads of the material.
The upper part of the trunk is known as the thorax, or chest, and the lower part as the abdomen. The portions of the trunk to which the arms are attached are the shoulders, and those to which the legs are joined are the hips, while the central rear portion between the neck and the hips is the back.
In Tillus elongatus the male is black, and the female always, as it is believed, of a dark blue colour, with a red thorax. The male, also, of Orsodacna atra, as I hear from Mr. Bates's collection, are generally redder but rather duller than the females, the latter being coloured of a more or less splendid golden-green.
The quantity of air inspired depends on the size of the thorax, and the extent of its movements. These are effected solely by muscular contractions, and give rise to an increase in all the diameters of the thorax.
There was a narrow thorax showing the distinct beads of rickets; the upper and lower limbs were very short, but improved under antirachitic treatment. The child died of pneumonia. The other two cases were in adults, one thirty-nine and the other thirty-six. The men were the same height, 49 inches, and resembled each other in all particulars.
You need not fear that the operator will make any mistake in this micrometrical performance: her sting always slants towards the thorax, although the opposite inclination is just as practicable and easy. What would be the outcome of a there or thereabouts under these conditions? Very often a corpse, a form of food fatal to the grub.
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