Scytodes thoracica is a spitting spider because it spits a poisonous sticky silken substance over its prey. Its size ranges between 3–6 mm ( ). The carapace is unusual in sloping upwards towards its rear end, whereas the abdomen slopes downwards. It has six eyes instead of the eight spiders usually have. It is found in the Holarctic, Australia, and on some oceanic islands in the Pacific. This particular spitting spider features the presence of silk glands in its cephalothorax.