In September, 1873, Mr. T. L. Mead, who was then at Coalburgh, observed a ♀ pseudargiolus depositing eggs upon the flowers of Actinomeris squarrosa, and on examining the flower heads found a number of eggs. He brought home two of the females, and enclosed them in a muslin bag upon the flower heads of the same plant, near my house, the plant being not at all an uncommon one here. Several eggs were soon deposited, and in due time the larvae were hatched and some of them were carried through to chrysalids, a change which occurred about the middle of October.

♂. Eyes naked, all the tibiae spinose antennae brush-like. Thorax, head and appendages brownish red. Anterior wings brownish red, silky, Median lines faint, blackish, tolerably approximate. T. a. line nearly straight, t. p. line eyenly rounded, tending to be obsolete on the veins; costal dots mark the inception of the lines. Median shade very faint, Stigmata ohsolete; there is merely an indication of the reniform. Subterminal line pale, narrow,continuous; terminal space darker than the wing, the fringe ligher.

Expanse 34 m. m. Length of body 14 m. m. Eyes hairy; antennae of the male simple; villosity of the palpi coarse; thorax provided with the usual fore and hind tufts; abdomen short, stout and untufted; ground color of the anterior wings gray without ochreous or brown admixture, as in M. lorea Guen.; the ordinary spots are tolerably distinct, concolorous, black encircled, the reniform filled below with black, the clavifor small; the median lines are simple, black and conspicuous, the interior line perpendicular, forming a triangular projection above the orbicular spot, which it touches.

Palpi dark brown, with a yellowish white annulus around the middle and tip of the second and third joints. Head yellowish white; antennae dark brown, with the extreme tip of the basal joint white. Thorax above and base of the forewings brown: dorsal margin of the forewings, from the base to the ciliae, pale orange yellow, with a broad fascia of the same hue at about the basal fourth, passing across the wing and gradually narrowing to the costa.