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Show 478 ON T H E C O L E O P T E R A O F SOCOTRA. [Apr. 5, posteriorly, where they are more convex, declivous at the apex; each elytron has eight rather strongly impressed, finely and closely punctured striee, the fourth and fifth much shorter than the others, and united posteriorly ; the interstices are slightly convex, opaque, finely and rather thickly punctured. 12. PlAZOMIAS VERMICULOSUS, 11. Sp. Nigro-fuscus, squamis griseo-sabulosis dense vestitus; rostro tri-sulcalo; thorace vermiculoso, lateriBus Bene rotundatis, basi marginata; elytris fortiter striatis. Long. 6-7J nn# This species has much the form and general appearance of Herpy-stichus eremita. Rostrum nearly parallel, flattened above, longitudinally rugulose ; with a fine impressed median line reaching nearly to the vertex ; and on each side there is a longitudinal impression. The eyes are moderately prominent, rather less than a semicircle viewed from above. Thorax a trifle broader than long, truncate in front and behind, moderately rounded at the sides, broadest rather behind the middle, slightly depressed on the disk, with a well-marked median channel which does not reach the front margin; all the surface (except the anterior border) vermiculose, and divided into rather irregular round areas, which have generally one puncture about the middle; the disk is covered with pale scales ; and there are some very pale scales at the sides ; the base is margined. Scutellum very small, shining black. Elytra at the margined base a very little wider than the base of the thorax, but immediately becoming wider (without, however, making any distinct shoulders), oblong-ovate, convex, sloping down and somewhat acuminate at the apex, strongly striated, the strise strongly but uot closely punctured; the interstices almost flat, covered with sandy grey scales, with small dots of a paler colour at intervals on the strise; the scales on the margins of the elytra and on a spot on the hinder femora are also paler. Tarsi grey. MALLODON ARABICUS. (Plate XLIII. fig. 7.) Mallodon araBicus, Buquet, Rev. Zool. 1843, p. 330 (?). Two examples brought by Piof. Balfour appear to be referable to this species; they are, however, smaller than the size given for the Arabian specimen, being only 22 lines in length ; and there are one or two other points in the description that leave room for doubt. The Socotran examples have the head densely and strongly rugose: the thorax has the anterior angles very much advanced, but rounded at their apex; the sides are much flattened, so as to be below the level of the disk, and, although opaque, the flattened parts are not very rugosely sculptured. EXPLANATION OF PLATE XLIII. Pig. 1. Histeromorphus plicatipennis, 473. 2. Opatrum costiferum, p. 476. 3, Adelostoma bicarinatum,-pA75. Pig. 4. Apithcsis obesa, p. 477. 5. Eusyntelia balfouri, p. 474. 6. glabra, p. 475. 7. Mallodon arabicus, p. 478. |