XEOKIXOPIS SEPULTA. 31 



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 nervnre, opposite 

 the middle of the upper border of the cell, toward the middle of the apical 

 half of the snbmedian nervure; but it extends slightly outward on reaching the 

 lowest median nervnle 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 inter- 

 space; 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 iippcr 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 ex- 

 tremity, 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 mid- 

 way 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 ner- 

 vule 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 

 1 tarts 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 con- 



