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The mesothorax, or middle segment of the thorax, which is two or three times larger in diameter, is flattened in front and separated from the nipple formed by the prothorax and the head by a deep, narrow, curved fissure. On its front surface are two pale red stigmata, or respiratory orifices, placed pretty close together.
The point wounded has never varied in the series of combats under glass: it occupies the middle of the line of demarcation between the prothorax and the mesothorax, on the ventral surface. Similarity of nervous organization occasions similarity of method. Judging by the movements of the tip of the abdomen, one would certainly say that the weapon is exploring and selecting.
Head, antennae, and feet yellow; eyes black; the scutellum of prothorax yellow; the scutum of mesothorax black, with the scutellum yellow; the scutum of metathorax yellow, with the scutellum black, and the axillae yellow. The wings yellow, with dusky tips. The first segment of abdomen has the petiole black.
Underside of the mesothorax and metathorax with many greenish scales. Legs thick, polished, and with scattered grey hairs proceeding from the punctures. I have named this somewhat mourning Pachyrhynchus after Captain Owen Stanley and his father, the late venerable Bishop of Norwich and President of the Linnean Society.
A pair of stigmata on the mesothorax, near the line of junction with the prothorax; a stigma on either side of the first eight abdominal segments; in all nine pairs of stigmata, distributed like those of the pseudochrysalis. These stigmata are small, tinged with red and rather difficult to distinguish.
On either side we count nine stigmata, set as before on the mesothorax and the first eight abdominal segments. The first eight breathing-holes are dark brown and stand out plainly against the yellow colour of the body. They consist of small, shiny, conical knobs, perforated at the top with a round hole.
These are the mesothorax and the first eight abdominal segments. As in the Sitaris-larvæ, the last pair of stigmata, that of the eighth segment of the abdomen, is less developed than the rest. The head is horny, of a light brown colour. The epistoma is edged with brown. The labrum is prominent, white and trapezoidal.
Who would recognize in this clumsy, flabby, blind, hideously pot-bellied creature, with nothing but a sort of stumps for legs, the elegant pigmy of but a little while back, armour-clad, slender and provided with highly perfected organs for performing its perilous journeys? Lastly, we count nine pairs of stigmata: one pair on the mesothorax and the rest on the first eight segments of the abdomen.
On the thoracic segments are three pairs of tubercles, corresponding with the legs of the recent larva and the future insect. Lastly, there are nine pairs of stigmata, one pair on the mesothorax and the eight following pairs on the first eight segments of the abdomen.
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