Sentence:  In this book Upfield utilizes the full panoply of aboriginal lore — myths, beliefs, superstitions of the blacks; their communication by “<WSD>mulga wire</WSD>” (telepathy); walkabouts, medicine men, invisible shadowing; and all the other elements of the “Book of the Bush.” 
Meaning of the word marked with <WSD> tags:  Telepathy; a telepathic message.