These are plenty here and like to hang around on the forest floor. So far, i only see them hunt termites. Taken at night in Singapore.
Quote from en.wikipedia.org/wiki/Reduviid…
Predatory Reduviidae use the long rostrum to inject a lethal saliva that liquefies the insides of the prey, which are then sucked out. The saliva contains enzymes that predigest the tissues they swallow. This process is generally referred to as extra-oral digestion, or EOD. The saliva is commonly effective at killing prey substantially larger than the bug itself.
The legs of some Reduviidae have areas covered in tiny hairs that aid in holding onto their prey while they feed. Others, members of the subfamily Phymatinae in particular, have forelegs that resemble those of the praying mantis, and they catch and hold their prey in a similar way to mantis.
As nymphs, some species will cover and camouflage themselves with debris or the remains of dead prey insects, which forms a very effective camouflage. The nymphal instars of the species Acanthaspis pedestris present one good example of this behaviour where they occur in Tamil Nadu in India. Another well-known species is Reduvius personatus, known as the masked hunter because of its habit of camouflaging itself with dust. Some species tend to feed on pests such as cockroaches or bedbugs and are accordingly popular in regions where people regard their hunting as beneficial. Reduvius personatus is a case in point, and some people breed them as pets and for pest control. Some assassin bug subfamilies are adapted to hunting certain types of prey. For example, feather-legged bugs eat termites, and Ectrichodiinae eat millipedes.
Some research on the nature of the venom from certain Reduviidae is under way. The saliva of Rhynocoris marginatus showed some insecticidal activity in vitro, in tests on lepidopteran pests. The effects included reduction of food consumption, assimilation and utilization. Its anti-aggregation factors also affected the aggregation and mobility of haemocytes.
Some species are blood suckers rather than predators, and they are accordingly far less welcome. Triatoma species and other members of the subfamily Triatominae, such as Rhodnius species, Panstrongylus megistus and Paratriatoma hirsuta, are known as kissing bugs, because they tend to bite sleeping humans in the soft tissue around the lips and eyes. A more serious problem than their bites is the fact that several of these haematophagous Central and South American species transmit the potentially fatal trypanosomal Chagas disease, sometimes called American trypanosomiasis.