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Show 1879.] ARACHNIDA FROM MADAGASCAR. 731 each side beyond the blackish bands clothed with depressed whitish pile ; palpi, excepting the bulbus and under surface of body, horn-yellow; bulbus castaneous, clothed with pale brown hair above, black below; falces castaneous, clothed with pale hair; legs sparsely clothed with pale hair and with black spines ; abdomen above brown, densely clothed with short pale greyish-brown hair. Cephalothorax ovoid, truncated "in front, very slightly indented in the middle behind, shelving at the sides, but flattened along the dorsal or central longitudinal region; sutural outline of the caput feebly indicated ; margins of cephalothorax behind the caput regularly convex ; abdomen oval, flattened or truncated in front, posterior extremity obtusely pointed; pectoral shield oval and indistinctly nine-sided; coxae barrel-shaped, those of the two anterior pairs of legs with straight anterior and convex posterior margins. Relative length of the legs 1 and 4, 2, 3; relative length of joints as follows:- femoral joints-first pair 8| millimetres, second pair 7, third 6, fourth 8 ; tibial (including basitibial or knee-joint)-first pair 11, second 9, third 7, fourth 11; tarsal joints or tarsus-first 13|, second 11|, third 9, fourth 14. Falces large, with three conical denticles on the inferior margins, and with a powerful curved movable fang; palpi about 9 millimetres in length, with the bulbus large, pyriform, and incurved. Length of cephalothorax and abdomen together (exclusive of falces) 17 millimetres. Antananarivo (Kingdon). 2. GASTERACANTHA BORBONICA, Vinson. Antananarivo (Kingdon). 3. GASTERACANTHA ACROSOMOIDES, Cambridge. Antananarivo (Kingdon). 4. COSROSTRIS TUBERCULOSA, Vinson. Fianarantsoa (Shaw). Unfortunately these specimens were allowed by the collector to get nearly dry and were injured by mould. 5. CCEROSTRIS MITRALIS, Vinson. Antananarivo (Kingdon). One specimen, agreeing well with the figures. 6. COSROSTRIS STYGIANA, n. sp. (Plate LVIII. figs. 4,4 a, 4 b.) 2. Cephalothorax black, covered when dry with golden pile, posterior portion castaneous; legs above black, banded at base of tibiae and tarsi with white ; coxae and femora below castaneous ; falces black, fringed above with golden hair ; maxillae orange above, dark castaneous, fringed with dull lake-red hair, below; labium and pectoral shield blackish; abdomen above testaceous, below black. Cephalothorax nearly square, but convex at the sides, almost perpendicular behind the caput; the latter more than twice as wide as long, with six projecting horizontal processes or prominent tubercles, |