A friend of mine—Mr. R. J. Mendenhall, of Minneapolis, Minn.—while travelling in Mexico last winter, collected from a tree, supposed to be the wild olive, a number of the cocoons of some large Bombycid. On his return home he kindly gave these cocoons into my keeping, with the information that he could easily have collected hundreds had he had con veniences for carrying them, as the trees on which they were found had been ruinously defoliated by the insect in its larval state. The cocoons were about the size and somewhat resembled those of Telea polyphemus, but were rather more elongate and were not intermixed with the chalky substance seen on the surface of the latter. They depended from the twigs by bands or cords of silk from five to seven inches long.