The present paper contains descriptions of a new genus and two species of fossil insects of the family Mesotitanidae, Order Protohemiptera from the Middle Triassic beds of Beacon Hill, Brookvale, N. S. Wales. They occur in a lenticular mass of shale, about twenty-five feet in thickness, enclosed in the Hawkesbury Sandstone. From the same beds a large series of fishes has been obtained; these have been described by Dr. R. T. Wade. I have also included notes on a fossil wing of Mesotitan scullyi Till., which is in a more complete state of preservation than the type specimen.
A few notes regarding Clatrotitan andersoni, sp. nov., and its discovery will be of interest. The fossil was collected by Mr. W. Bass, foreman of a brick quarry at Beacon Hill, Brookvale, near Manly, to whose interest this Museum has been indebted for many interesting specimens from time to time. From Mr. Bass the specimen was obtained by Dr. C. Anderson, Director of the Australian Museum.