on the other hand which are more likely to be inaccurate are the basal halves of the median interspaces of the fore wing and the contiguous portion of the medio-submedian interspace. Assuming, however, that the drawing faithfully represents the real markings of this extraordinarily preserved fossil, a detailed description of its features follows. The basal portion of the fore wing (Pl. I, fig. 8) is very dark, and increases in intensity toward the border of the innermost light patch; the latter is bounded by a line running in a nearly straight course from the costal nervure, opposite the middle of the upper border of the cell, toward the middle of the apical half of the submedian nervure; but it extends slightly outward on reaching the lowest median nervule and just below this turns baseward and makes a large ovoid curve of an interspace’s diameter, returning to its course when it has nearly completed the circuit and reached the middle of the medio-submedian interspace; the outer limit of this large pale patch, which crosses the cell and extends nearly to the middle of the lower median interspace, nearly follows a line running from the upper extremity of the inner border to and along the middle median nervule. Beyond this the upper half of the wing, half-way to the apex, is nearly as dark as the basal part, excepting in a large light patch which crosses the lowest two subcostal and the subcosto-median interspaces, is broadest in the middle, but twice as broad at the upper as at the lower extremity, and rounded throughout excepting at the angular upper basal corner; its interior margin is sharply defined, and is nearly parallel to the interior border of the inner light patch, extending in a straight line from the subcostal nervure midway between the origin of the first and second superior nervules to the upper median nervule, about as far from its origin as it is from the base of the first median nervule; the exterior border is powdery, strongly convex and, starting from the subcostal nervure midway between the bases of the second and third superior nervules, joins the other border on the last median nervule; this patch is twice as long as broad. Extending from the next to the lowest subcostal nervule to the internal nervure, parallel to the outer border, is a broad indistinct pale band, broadening below, and on either side merging indefinitely into the darker parts of the wing, separated from the light patches by only a narrow belt of dark scales, which becomes narrower and fainter in the lower half of the wing; at its broadest the pale band is a little broader than an interspace, and it contains in its middle and at the middle of each interspace, as well as in the next to the lowest subcostal interspace, a series of large circular dark spots, of nearly or quite half the width of the interspaces in which they fall, often, and especially in the upper interspaces, enclosing a small black pupil; these