AUSTINIXA, A NEW GENUS OF PINNOTHERID CRAB (CRUSTACEA, DECAPODA, BRACHYURA), WITH THE DESCRIPTION OF A-HARDYI, A NEW SPECIES FROM TOBAGO, WEST-INDIES

The new genus Austinixa is recognized for Pinnixa cristata Rathbun and six other species formerly assigned to Pinnixa White, 1846. An eighth species, A. hardyi, new species, is described from Tobago, West Indie s. Members of Austinixa can be distinguished from species of Pinnixa s ensu stricto by the transverse ridge that completely crosses the poste rior surface of the carapace, the strongly deflected fingers of the ch elae, and the much longer, slenderer, and smoother third walking leg. Members of Austinixa often are associated with callianassid shrimps. A ustinixa hardyi, new species, found associated with a member of the ca llianassid genus Callichirus Stimpson, 1866, is the only described spe cies of Austinixa having dense patches of setae on the carapace of the male.