Megisthanus thorelli Womersley, 1937

Megisthanus thorelli Womersley, 1937: 177 .

Material examined. In addition to material listed in Seeman (2017), the following non-type material was examined from non-type localities in Queensland, Australia. Main Range NP, ex Mastachilus quaestionis . 3 females, 1 major male, Box Forest Track, Cunningham’s Gap, 28°02′S, 152°23′E, 18.iv.2012, H. Urbina, J. Bartlett & O. Seeman, beetle BG- 12-4-18-11 -1-1 (QMS 109455–8). 2 females, 1 major male, Mt Mitchell track, O. Seeman, 11.ii.1996, beetle #175 (log 1, passalid 1) (QMS 109459–61) . Lamington NP, ex M. quaestionis . 2 females, Box Forest Circuit, 13.ii.1996, O. Seeman, beetle #321 (log 1, passalid 1) (QMS 109464–5) ; 2 females, same data except beetle #322 (log 2, passalid 2) (QMS 109462–3); 1 major male, same data except beetle #332 (log 3, passalid 3) (QMS 109466) . Goomburra State Forest, ex M. australasicus (southern form). 1 female, 1 major male, 27°58′S 153°30′E, 18.iv.2012, H. Urbina, J. Bartlett & O. Seeman, beetle BG 12-4-18-14-6-1 (QMS 109474– 5) . Jimna State Forest, ex Pharochilus dilatatus . 4 females, 1 major male, 1 minor male, Peter’s Rd, Sunday Ck, 17.iii.1996, O. Seeman, beetle #201 (QMS 109467–72) . 1 female, 2 km E Sunday Ck, 17.iii.1996, O. Seeman, beetle #197 (QMS 109473) . All in QM. Imbil, ex passalid. 1 major male, 11.ix.1946, F.J. Gay (on several slides: J17337 –43, J17356). 1 female, same data (on several slides: J17345 –17352). 1 female, same data (two slides: J17317, J17344). Lamington NP, ex passalid. 1 female, 1 major male, H. Womersley, 1949 (J17329, J17313). All in SAM .

Diagnosis. As per Seeman (2017).

Remarks. This common species from southeast Queensland is often found on Mastachilus quaestionis, Australia’s largest passalid beetle, but was also recorded from M. australasicus (the southern form only) and P. dilatatus . Mastachilus quaestionis is found only in rainforests, while M. australasicus tends to be found in sclerophyllous forests; the widespread species P. dilatatus tends to be found in wet sclerophyll to rainforest.