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Updated: June 13, 2025
In these insects it consists almost invariably of three lobes, the outer being the palpus, the middle lobe the galea, and the innermost the lacinia; the latter undergoing the greatest modifications, forming a comb composed of spines and hairs varying greatly in relative size and length. How much the palpi vary in these groups of insects is well known.
Other species of spiders closely resemble stinging ants; in all of them the body is drawn out long like an ant, and in some the maxillary palpi are lengthened and thickened so as to resemble the head of one. I am convinced that this explanation is incorrect so far as the Central American species are concerned.
The result was most gratifying: a drop of water upon the tip of a camel's-hair pencil, not only was not avoided, but greedily seized and slowly swallowed, being held between the jaws and the palpi. All of the spiders took it, and some even five or six drops in succession. You will exclaim, "Poor things! what tortures they must have suffered!"
They rarely enter the abodes of man, and may be easily identified by their heavy, feathery antenn and long maxillary palpi. Unfortunately for mankind, the female mosquito possesses a most elaborate instrument of torture.
The maxillary palpi are greatly developed, but the chief characteristics are the two-jointed stylets arranged in nine pairs along each side of the abdomen, reminding us of the abdominal legs of Myriopods. The body ends in three long bristles, as in Lepisma.
By the time that an animal had reached, after numberless generations, the deepest recesses, disuse will on this view have more or less perfectly obliterated its eyes, and natural selection will often have effected other changes, such as an increase in the length of the antennae or palpi, as a compensation for blindness.
Up he comes again. He has learnt, from certain symptoms, that we are at last yielding to his blandishments. With his legs and especially with his palpi, or feelers, he teases the buxom gossip, who answers with curious skips and bounds. Gripping a thread with her front tarsi, or fingers, she turns, one after the other, a number of back somersaults, like those of an acrobat on the trapeze.
Conspicuous amidst these nocturnal moths is the richly-coloured Acherontia Satanas, one of the Singhalese representatives of our Death's-head moth, which utters a sharp and stridulous cry when seized. This sound has been conjectured to be produced by the friction of its thorax against the abdomen; Reaumur believed it to be caused by the rubbing of the palpi against the tongue.
At the foot of the slope is the vestibule of the horizontal gallery. Here, as a rule, the hunter lurks, motionless, with his pincers half open. He is waiting. There is a sound overhead. It is a specimen of game which I have just introduced, a Cicada, a luscious morsel. The drowsy trapper at once wakes; he moves his palpi, which quiver with cupidity.
The labrum is prominent, is not distinctly divided from the head, is curved in front and edged with pale and very fine bristles. The mandibles are small, reddish toward the tips, blunt and hollowed out spoonwise on the inner side. Below the mandibles is a fleshy part crowned with two very tiny nipples. This is the lower lip with its two palpi.
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