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Show 72 PBOF. P. E. UHLER-ENUMERATION OF THE [Jan. 15, Length to tip of abdomen 5-6 mm.; expanse of wing-covers 15-16 m m . Ten specimens were collected at various localities on the island. This is an exceedingly variable species as regards colour and pattern of marking. One specimen is mostly white, with a band of fuliginous on the apex of the wing-covers. Between this and the variety with a large triangular dark spot on the apical half of the pale tawny wing-covers there is a series of several degrees of expanse of the dark colour. The wings vary from pure white to dark lead-colour. I do not find any important differences to separate this from a species which is quite common in northern . Mexico, Arizona, Texas, and California, and which approaches 0. mesochlorus, Walker, from Cuba; but this latter has broader wing-covers and a longer, more prominent vertex. SCARPOSA, gen. nov. Robust, wing-covers decumbent, nearly twice as long as wide, broadly arcuate from base to behind the middle, then sinuated and narrower to the apex. Head viewed from above wider than long, the vertex with an excavation which widens anteriorly, each side of this is an indentation bounded exteriorly by the arched carinate margin ; cheeks nearly flat, extended widely in front of and below the eyes, grooved above next the reflexed margin, callous next below; front subtrapezoidal, barely wider than long, longitudinally tumid each side, impressed in the middle, grooved against the raised lateral margins, a little sinuated above, with a narrow callosity at the summit; clypeus long, acutely tapering, the margins reflexed. Eyes small, globular, prominent. Antenna? short, bluntly rounded at base. Pronotum semicircular, but little longer than the vertex, sinuated at base, with the lateral flap triangularly produced against the eye. Mesonotum wide, a little wider than long, almost flat, the anterior margin bluntly triangular; the sides rectangularly triangular, and posteriorly longer, more converging, and forming a triangle with the short scutellum ; the middle line obsoletely carinate, and the margins of the disk thick and set with two callous knobs. Basal margin of clavus convexly inflated, with the submargin carinately crested and together Math the inner margin forming an arch, the clavus behind this tapering narrowly back to the base of the membrane the surface more or less granulated to near the tip ; corium with wide and long areas which are crossed by mostly indistinct reticulations behind the middle, but with distinct oblique and irregular veins beyond the middle of the postcostal area, veins of the wide costal area numerous and moderately oblique, almost the entire surface sprinkled with callous granules; veins of the sub-quadrangular membrane curving in various directions and formino-crowded and irregular cells, the apical series composed of sub-quadrangular areoles of larger size which are narrower above the middle. Posterior tibise grooved, armed with two stout spines below the middle. Abdomen blunt, subconical, |