[102] Ταιναρίην: at Taenarus in Laconia (v. 179) there was said to be an entrance to the underworld, cf. Virg. G. 4. 467, “Taenarias etiam fauces, alta ostia Ditis.”
ἀίδηλος: 'unseen.' Ap. uses this adj. freely, and it is not easy to determine the precise meaning in each case. It seems to mean 'unseen,' or 'dimly seen,' here, and in 4. 47, 865; 'unsuspected,' 'unforeseen,' in 1. 298, 2. 138; 'destructive,' 'baneful,' in 3. 1132, 4. 1671; 'indefinite,' ambiguus, in 4. 681. In the sense of 'unseen,' Hom. uses ἀίζηλος, and he always has ἀίδηλος with the one meaning, 'making invisible,' and so 'destroying' (ἀφανίζων); v. Buttm. Lexil.