Scoloderus is a genus of orb-weaving spider

Spider

Spiders are air-breathing arthropods that have eight legs, and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms...

 of the family Araneidae which feed largely on nocturnal moth

Moth

A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...

s. Scoloderus spiders make a "ladder" type nest with vertical extensions of sticky orbs above and below the circumference of the primary orb. When a moth strikes the web, it slides down the ladder, leaving behind scales on the sticky silk till it is completely ensnared.