Essential research

Orthodox advice to writers is to query only agents who represent your genre. The best way to do this is to read Publishers Weekly for six months in advance of querying and note who reps what you write.

http://www.publishersweekly.com/Community/Deals/47146.html

The magazine is online, and recent deals are posted every Monday. Use the search function if you want to find any article or review in your subject area. For example, if I search for "magical realism," "Palestine," and "folklore," I will come up with dozens of options. Then I'd go to AgentQuery.com or PublishersMarketplace.com to follow up on the information--and finally to the library to make sure that my book really is similar to the ones I've found.

Good hunting.