A REVISION OF THE MICROTROMBIDIINAE (ACARINA, 
TROMBIDIIDAE) OF AUSTRALIA AND NEW GUINEA 
By H. WoMERSLEY, F.R.E.S., A.L.S., ENTOMOLOGIST, 
SOUTH AUSTRALIAN MUSEUM 
Summary 
In the Zool. Anz., 1935, 109 (1/2), 107-112, Sig Thor in reviewing the family 
Trombidiidae, divided it into ten subfamilies, the sixth of which he called the 
Ottoniinae, with the genus Ottonia P. Kramer, 1877 (as emended by G. Canestrini, 
C.F. George and himself) as the type. Later in the same publication (1935, 110, (1/2), 
47) he changed the subfamily to Microtrombidiinae with Microtrombidium G. Haller, 
1882, as type, on the grounds that Ottonia was preoccupied by Gistel 1848, in the 
Crustacea and by von Malm, 1873, in the Vermes. 
In the Records of the South Australian Museum 1937, 6, (1), 75-100, the present 
writer reviewed the then known Australian species of Trombidiidae in the light of Sig 
Thor’s studies. 
