Footnote
After “Ephraim” LXX adds five more names, as it reads: “But there were sons born to Manasseh, whom his Syrian concubine bore to him, namely, Machir. And Machir became father to Galaad. But the sons of Ephraim, Manasseh’s brother, were Sutalaam and Taam. And the sons of Sutalaam were Edem.” This may explain why LXX, in Ge 46:27 and Ex 1:5, and Stephen, in Ac 7:14, count 75 souls instead of 70.