A clear and accurate system of argument diagramming must give a suitable representation of the distinctions made among different argument structures in ordinary language. To argue is to present to someone something as a reason for another thing; i.e. to exhibit, offer for examination or lay before someone’s cognizance something as a reason for another thing. To achieve this the arguer uses different conventional tools, including argumentative connectors. These are words or expressions that structure a text, establishing argumentative relations between two or more statements. My thesis is that a satisfactory technique of argument diagramming has to apprehend and picture the relations signified by argumentative connectors. As an illustration I will diagram the predation argument as analyzed by C.K. Fink in “The Predation Argument”.Keywords: argument structure, connectors, diagramming, metaargumentation, reductio ad absurdum, weighing.