The Semacheion is convincingly explained by Oikonomos as the shrine of Semachos, who gave his name to the deme Semachidai[206]. From this fact he proceeds quite logically to argue that we must decide on a more Southerly position for that deme than those proposed by Milchhoefer and Loeper[207], “since the mine to the South of which Semachidai lay, was situated in the neighbourhood of Laurium[208].” Semachidai belonged to the tribe Antiochis[209]. In the electoral organization of Cleisthenes the coast trittys of the tribe Antiochis occupied the Western part of the mining district, including the villages of Amphitrope (Metropisi), Besa, and Anaphlystus. Thus Oikonomos’ conclusions are confirmed by the fact that his Semacheion falls within the borders of Antiochis. But whereas technically this mining district formed the coast trittys of the tribe, we have the evidence of Philochorus, writing early in the third century B.C., that it was spoken of as part of the Epakria or hill country[210]. How suitable this name was may be illustrated from the Semacheion inscription itself, in which the sites of mining claims are three times defined by reference to a ridge or hill crest (λόφος)[211]. As seen from _C.I.A._ II. 570, the Epakria of 400 B.C. was a religious organization[212], apparently with only a local political significance. [Sidenote: and probably the Hill Country _par excellence_.] This fact makes it probable that the name was already ancient, and that Plutarch and the _Lexicon Seguerianum_ were right in equating it with Diakria and Hyperakria[213]. There is indeed the possibility of a confusion of names. But on the other hand the names suggest a common origin. They are all compounds of ἄκρον. It is curious that nobody in recent times seems to have asked what was the ordinary connotation of ἄκρον to the Athenian of antiquity[214]. There seems little doubt as to what it was. In Attica the ἄκρον _par excellence_ was Sunium. Already in the _Odyssey_ Sunium is the ἄκρον Ἀθηνῶν[215]. The same phrase reappears in Aristophanes[216]. Strabo refers to Sunium as τὸ τῆς Ἀττικῆς ἄκρον[217]. Some early scholars recognized this fact. Palmerius explained the Diakrioi as the people living between the two capes, Sunium and Cynosura, and the Hyperakrioi as those who dwelt beyond Sunium, “beyond” being used presumably from the point of view of those coming by sea from Athens[218]. Albertus held that the Diakrioi were so called because they lived “in promontoriis Atticae[219].”