ArcGIS.com doesn't support adding layers with a query expression. The map in ArcGIS.com also doesn't currently support defining a query on a layer. However, our Silverlight based application, ArcGIS Explorer Online, will allow you to define such a query (called a filter) and apply it to a layer in the web map. Subsequently, the ArcGIS.com map viewer will respect this layer filter when opening the web map.Here's a help topic that describes how to filter the data in a layer.http://help.arcgis.com/en/arcgisexplorer/help/#/Filter_features/015600000059000000/Thanks,Mike
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