I’m reading Robin Lane Fox’s Travelling Heroes (American edition) and on page 196 he writes “At Solonus, west of Palermo, he [Heracles] killed the settlement’s namesake, who showed himself hostile to strangers. 38”. Footnote 38 is “Hecat., FGrH I, F77.”
You have found the quote, but just to clear up the fragment number: confusingly, FGrH (Die Fragmente der griechischen Historiker, ed. Jacoby) is different from FHG (Fragmenta Historicorum Graecorum, ed. Mueller). The former is the standard collection cited by scholars (hence its appearance in Lane Fox), and the numbers are retained in the ongoing ‘Brill’s New Jacoby’. But its online versions can be accessed only with an individual or institutional subscription to Brill. Mueller’s 19-century collection is, obviously, less complete and less authoritative, but it is freely available online. That is why the same fragment can appear with two different numbers.