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Show 220 • PROF. P. R. UHLER ON T H E [Mar. 6, the pleural flaps strongly curved, margined with yellow. Scutellum concealed beneath the *end of pronotum. Legs slender, tinged with fuscous, paler at base; the anterior femora dull testaceous, about half as long as the middle pair, the posterior pair nearly twice as long as the middle one, and likewise the same in the tibiae. Hemelytra whitish translucent, with the veins black and thick; when the wings are closed the submarginal areole forms a long silvery streak which is followed behind by an oval areole of like colour, and this in turn is followed at tip by a similar spot which does not fill the areole ; wings milk-white. Tergum dark brown, venter at tip and coxae pale testaceous, the connexivum bordered with pale yellow. Length to tip of venter 3-3^ mm.; width of pronotum 1 m m. Several specimens of this remarkable insect were taken on the Mount Gay estate, September 21-26, on water in a large iron kettle. This species stands by itself as regards the remarkable elongation of its posterior legs. It thus helps to bridge over the gap between this group and the Hydrobatidce, although but few of the other elements of its structure have undergone important modification. 5. MICROVELIA MODESTA, sp. nov. Similar to M. longipes, but much more robust, dark brown or fuscous, velvety opaque above, paler fuscous beneath and spread with plumbeous bloom. Head long, tapering at tip, with a convex ridge on the middle line; the throat, cheeks, and border of the orbits of the eyes testaceous; antennae of medium thickness, dull testaceous, more infuscated on the ends of the joints, the fourth joint longest, the second shortest, and the basal one a little shorter than the third; rostrum testaceous, piceous at base, on the middle line, and at tip. Pronotum steep anteriorly; the collum marked each side with yellow, spread with whitish bloom, and having the slender carina on the middle black; this carina runs back to the apex of pronotum ; humeral border triangular, a little elevated at tip ; apex of the pronotum triangular, feebly curved; border of the posthumeral sinus and the posterior margin of the epipleural flap testaceous ; underside of collum, sternum, coxae, and femora testaceous, remainder of legs dusky testaceous, more infuscated near the articulations and on the tarsi. Scutellum blackish, all but the tip concealed. Hemelytra wider than in M. longipes, milky whitish on the clavus and in all the areoles, the veins dark brown, and the costal border black or fuscous, sinuated, the apical areole with a large, ovate, white spot. Connexivum yellow; middle line of the venter and the genital segments dull fulvous, the middle sometimes with a slender black line. Length to tip of venter 2f-3mm.; width of pronotum 1\ m m. The middle femora are about one third longer than the anterior ones, and the posterior femora are nearly one third longer than the middle ones. One female is shorter and darker than the others. |
