The specimens described in this paper come from a very large collection of Mount Crosby insect remains, made over the last fifteen years. A large proportion of the material was collected by J. H. Simmonds, Senr., 0. A. Jones, H. Cribb, and F. A. Perkins, to whom a debt of gratitude is owed. The remainder of the collecting and the descriptive work were financed by a Commonwealth Government grant to the University of Queensland through The Council for Scientific and Industrial Research.
Geological Note :
"The Mount Crosby Insect Horizon is situated near the Brisbane River, five miles to the north of Ipswich. The horizon was first discovered by Jones and Denmead in 1925 on Por. 172, Par. Chuwar. From this outcrop (Loc. A.) insect wings were collected and exhibited before the Royal Society of Queensland (Jones, 1926). The stratigraphical horizon of these was indicated by Jones (1927) in an appendix to a paper on the Tertiary Deposits of the Moreton District. The insects were later described by Tillyard (1937) as two new species of the genus Triassoblatta" (Tindale, 1944).