5. Cataulacus horridus ^HNS. B.M.

Worker. Length 3 lines. - Black: the posterior angles of the head spinose, the margins of the head crenulated; the thorax armed posteriorly with two elongate, stout, acute spines; the an- tennae short, thick and clavate, their apex rufo-testaceous; the head reticulated, produced before the eyes and widely truncated anteriorly, the lateral angles of the truncation rounded, the lateral margins of the head with a short spine before the eyes; the pos- terior margin of the vertex emarginate its entire width, the lateral angles produced into long acute spines. Thorax ruggedly sculptured on the disk, narrowed to the apex of the mesothorax, which is separated from the hinder portion by a deep transverse incision, the posterior angles produced into long acute spines. The nodes of the peduncle rugose; the abdomen rounded, emar- ginate, and striated at the base; the entire insect sprinkled with short, erect, white setae.

Hab. Borneo (Sarawak).