| abstract | The family Pachylaelapidae Vitzthum, 1931, in Tenerife Island (Canarian Archipelago) is represented by Pachyseius humeralis Berlese, 1910, and twelve species of Pachylaelaps, seven of which are new for science P. silviae, P. mandibularis, P. auricularis, P. intermedius, P. glandularis, P. canariensis and P. subkarawaiewi. P. longisetis, Halbert, 1915, P. brachyperitrematus, Koroleva, 1977, P. regularis, Berlese, 1921 are recorded, and two unknown species which are not considered new, because of the absence of female specimens, are described. The ontogeny and notation of the dorsal chaetotaxy is discussed. |