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Show 764 MR. A. G. BUTLER O N [Dec. 19, This and the following are allied to G. quadrata of Ceylon; if therefore the latter should be removed from the genus, they must go with it. 2. CHRYSSO NIVIPICTUS, sp.n. (Plate LVII. figs. 1, la.) 5 . Falces, maxillse, labium, sternum, and legs of a clear pale yellow colour ; the cephalothorax above black, with a lateral (almost marginal) pale yellow stripe on each side of the thoracic region ; abdomen above black, spotted with white as follows:-two small dots in the centre of the anterior region, two large transverse oval spots, one on each side behind these, two small spots beyond the middle, followed immediately by three large almost confluent spots, the central one transverse and with a small spot behind it; ventral surface shining black. Cephalothorax slightly broader than long, expanded laterally in a regular arch behind the caput, and depressed at the back ; caput similar in form to that of the preceding species, but the base of the falces rather more strongly indented in front; the anterior central and lateral eyes are also similar, but the posterior central eyes are smaller; the central oculiferous area represents a cone, the apex of which is truncated; between the two central pairs of eyes is a long bristle directed forwards and emitted from behind the eyes; the lateral margins of the head are sharply carinated and divided by a broad oblique shallow groove from the thoracic region ; the abdomen is quadrate, diamond-shaped, the lateral and posterior angles acute and spine-like, the dorsal surface very convex, rugose, the stigmata represented by shallow depressions, the ventral surface is keeled; the legs are slender, cylindrical, sparsely setose, their relative length 1,4, 2, 3. Entire length of body and cephalothorax 2 | millim. One example : Central Madagascar. THWAITESIA, O. P. Cambridge. This genus was described last year (P. Z. S. 1881, p. 766) for a Cingalese species ; and in this year's 'Proceedings' two additional species from the Amazons were added (see above, pp. 431, 432). 3. THWAITESIA PULCHERRIMA, sp. n. (Plate LVII. figs. 7, 7 a, b.) Nearly allied to T. margaritifera, from which it differs apparently in the form of the abdomen and its somewhat brighter coloration ; the abdomen is ornamented above with a large brown cruciform marking which passes into the lateral articulations. $ . The cephalothorax is pale yellow, adult examples having a more or less defined longitudinal dorsal carmine-red band from the oculiferous region backwards; the eyes are black ; the legs agree in colour with the cephalothorax ; the articulations of the tibiae and metatarsi of all the legs are more or less strongly banded with carmine, a portion of the extremities of the metatarsi being also red, excepting those of the front pair of legs, which are brown ; the fine |