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With the exception of a slight similarity about the region of the head, the worm bears no resemblance to the parent beetle. When full-grown, it is about 3-1/2 inches in length, having the body large and turgid, and increasing in circumference from the head towards the opposite extremity. The head is of a corneous, opaque substance.
The prothoracic ring, or segment just behind the head, is transversely oblong, being twice as broad as long; there is a pale dorsal corneous transversely oblong shield, being about two-thirds as long as wide, and nearly as long as the four succeeding segments; this plate is smooth, except on the posterior half, which is rough, with the front edge irregular and not extending far down the sides.
The under surface of the straight portion of the base is padded with a thick, naked, corneous skin; and, when the animal performs the curious sportive antics in which it occasionally indulges, it gives rapid loud-sounding blows on the ground with this part of the tail. The peculiar form of the tail also makes it a capital support, enabling the vizcacha to sit erect, with ease and security.
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