WArachnocoris is a small genus of true bugs found in the Neotropics.
WArilus is a genus of bugs in the family Reduviidae, subfamily Harpactorinae and tribe Harpactorini. Most species are found in the Americas.
WAsiarcha is a genus of bugs in the family Tessaratomidae. There are three species known from South and Southeast Asia.
WCallicorixa is a genus of water boatmen in the family Corixidae. There are about nine described species in Callicorixa.
WCeratocombus is a genus of litter bugs in the family Ceratocombidae. There are about nine described species in Ceratocombus.
WCoridius is a genus of dinidorid bugs. They suck sap mainly from plants belonging to the family Cucurbitaceae. About forty species are known with a native distribution mainly in Africa and Asia. Several species are eaten in parts of South and Southeast Asia. Some species have extended into Europe and are considered as pests on cucurbit crops.Coridius affinis (Costa, 1847) Coridius alternatus (Distant) Coridius assamensis (Distant, 1902) Coridius brunneus (Thunberg, 1783) Coridius castaneus (Signoret) Coridius chinensis (Dallas, 1851) Coridius cuprifer (Westwood, 1837) Coridius cuprinus (Stål, 1870) Coridius deckerti Lis, 1990 Coridius dimorphus (China, 1928) Coridius divergens (Distant, 1878) Coridius dubitabilis (Fairmaire, 1858) Coridius duraiae Lis, 1990 Coridius farleyi (Distant) Coridius flavomarginatus (Signoret) Coridius fuscus (Westwood, 1837) Coridius janus (Fabricius, 1775) Coridius kerzhneri Lis, 1990 Coridius laosanus (Distant, 1921) Coridius lenoiri (Schouteden) Coridius lividus (Distant, 1898) Coridius marginatus (A. Costa, 1847) Coridius neobrunneus Ahmad, Hussain & Kamaluddin, 1997 Coridius nepalensis (Westwood, 1837) Coridius nubilis (Westwood, 1837) Coridius nubilus (Westwood) Coridius patruelis (Stål) Coridius prolixus Lethierry, 1881 Coridius pseudaffinis Lis, 1996 Coridius pseudoflavomarginatus Kocorek, 2003 Coridius putoni (Bolivar) Coridius reflexus (Westwood, 1837) Coridius remipes (Stål, 1853) Coridius rufomarginatus Carlini, 1895 Coridius sanguinolentus (Westwood, 1837) Coridius singhalanus (Distant, 1900) Coridius turbatensis Ahmad, Hussain & Kamaluddin, 1997 Coridius viduatus (Fabricius, 1794) Coridius xanthopterus {{small|(Fairmaire)
WCyclopelta is a genus of Dinidorid bug found in Africa and Asia. There are 14 species in the genus with 8 found in Asia and 6 in Africa. Some species are known to form large aggregation on trees and can cause damage in a few trees of economic importance.
WElasmucha is a genus of shield bugs belonging to the family Acanthosomatidae.
WEpidaus is a genus of assassin bugs with about 25 species mainly distributed mainly in the Oriental Realm with two species which extend into the Palearctic Realm. Most species have a long and narrow body with the pronotum having a posterior margin with raised corners and spiny outgrowths facing outwards. The head a tubercle behind the base of each of the two antennae.
WHermatobates is a genus of wingless marine bugs placed as the sole genus in the family Hermatobatidae that are sometimes known as coral-treaders. They are quite rare and known only from coral reefs in the Indo-Pacific region. During low tide, they move over the water surface not unlike the more familiar water-striders around coral atolls and reefs and stay submerged in reef crevices during high tide.
WHesperocorixa is a genus of water boatmen in the family Corixidae. There are more than 20 described species in Hesperocorixa.
WMacrosaldula is a genus of shore bugs in the family Saldidae. There are more than 20 described species in Macrosaldula.
WMicracanthia is a genus of shore bugs in the family Saldidae. There are about 15 described species in Micracanthia.
WNabis is a genus of damsel bugs in the family Nabidae.
WNagusta is a genus of assassin bugs in the family Reduviidae.
WPentacora is a genus of shore bugs in the family Saldidae. There are about 12 described species in Pentacora.
WPetalocheirus is a genus of assassin bugs in the subfamily Salyavatinae. Species in the genus have a leaf-like broadening of the foretibia, and many species are known to be predators of termites. The genus is distributed in the tropics of Africa and Asia and species in apparently closely related genera such as Platychira may need further examination.
WProstemma is a genus of bugs in the family Nabidae, subfamily Prostemmatinae and tribe Prostemmatini.
WRhynocoris is a genus of assassin bug, family (Reduviidae), in the subfamily Harpactorinae. Species are recorded from Asia, mainland Europe, Africa and North America.
WSaldula is a genus of shore bugs in the family Saldidae. There are at least 120 described species in Saldula.
WVibertiola is a genus of assassin bugs in the tribe Rhaphidosomatini. Species have been recorded from southern Europe and North-West Africa.