Mastophora, also known as bolas spiders, is a genus of orb-weaver spiders first described by E. L. Holmberg in 1876. They can be identified by a pair of lumps on the dorsal surface of the opisthosoma, though not all males will have these lumps. Adult females of the genus snare prey mid-air by using a silk line with an adhesive blob on the end, similar to bolas used by South American gauchos. They feed on flying insects, particularly moths, sometimes releasing pheromones that mimic those of their prey to attract them. Males and juvenile females capture their prey directly with their legs.