How do Mexican red knee tarantulas catch their prey?

Most Spiders are 'ambush predators' - preferring to wait for prey to come to them (it uses less energy). Normally, a tarantula will wait for suitable prey to come within striking distance. It then lunges forward, grabbing the prey with its front legs. Using its pedipalps, it quick manoeuvres the prey into a position where it can inject venom from its fangs. It 'impales' the victim and hold it until the venom has taken effect to immobilise it. The venom injected liquefies the preys insides, before the spider 'sucks' up the resulting 'soup' - leaving a small pellet of undigested exoskeleton behind.