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cod; or, a poisonous beetle (see Molina)
One wonders whether the construction, tlalli (land) + xiquipilli (a bag or sack), refers to the beetle's appearance: "The back is rounded, ball-like; the neck slender, constricted; the nose has hair, or horns. The jaws are pointed. It has long legs. It is black, like bitumen. And this small insect lives only in the summer; it is not rare."
The tlalxiquipilli, a deadly poisonous black beetle, is described on f. 96v and pictured on f. 97r. of the Digital Florentine Codex.