. Crustacea. Miscellaneous. Crustacea. AND ANCIENT GEOGRAPHY. 311 distinction of species seems to be very arbitrary within these genera. Up to the present, about five or six species of Tricho- dactylus and about fourteen species of Dilocarcinus have been de- scribed. In the following we shall discuss them all together. The subfamily covers an area that comprises the larger south- ern half of Brazil (Bahia, Rio de Janeiro, Goyaz, Minas Geraês, S. Paulo, Sta. Catharina, Rio Grande do Sul). It is found in Paraguay, and in the Argentin- ian provinces : Missiones, Chaco and near La Plata (En
. Crustacea. Miscellaneous. Crustacea. AND ANCIENT GEOGRAPHY. 311 distinction of species seems to be very arbitrary within these genera. Up to the present, about five or six species of Tricho- dactylus and about fourteen species of Dilocarcinus have been de- scribed. In the following we shall discuss them all together. The subfamily covers an area that comprises the larger south- ern half of Brazil (Bahia, Rio de Janeiro, Goyaz, Minas Geraês, S. Paulo, Sta. Catharina, Rio Grande do Sul). It is found in Paraguay, and in the Argentin- ian provinces : Missiones, Chaco and near La Plata (Ensenada).1 Further, species of Trichodacty- lincz are very abundant in the Cordilleras, in the region of the headwaters of the Amazonas river, namely, in Bolivia (pro- vince Beni, Yocuma river, be- longing to the upper Madeira), in. Fig. 4. Distribution of the Crabs of the subfamily Trichodactylince. Peru (rivers Ucayali, Huallaga), and in the Maranon at Nauta and Loreto (Ecuador). Since there are also representatives known from the lower Amazonas (Island Marajó), all these localities named seem to form a continuous area, which extends from the Amazonas river southward to La Plata, and from the Atlantic Ocean westward over Brazil, Paraguay and Argentina to Bolivia and Peru, where it reaches the eastern slopes of the Cordilleras. Apparently isolated from this area, several species are found in Guyana, and, finally, one species {Trichodactylus quinquedentatus Rthb.) is known from the upper parts of the river Magdalena in Colombia, and from the Escondido river in Nicaragua. It is quite possible that the isolated stations in Guyana, Colombia and Nicaragua will be connected by subsequent discoveries (Colombia is very near to the localities of the upper Amazonas), and then we would have for this subfamily a continuous range, which comprises the whole of South America southward to La Plata, and from the Atlantic Ocean to the eastern slopes of the Cordilleras, and which extends in Cen
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