Bugs in the West

States: Colorado, Wyoming, Montana, Idaho, Utah, Nevada, California.

House and yard pests

Western Honey BeeWestern Honey BeeApis melliferaCan stingWestern Encephalitis MosquitoWestern Encephalitis MosquitoCulex tarsalisCan spread germs or diseaseConvergent Lady BeetleConvergent Lady BeetleHippodamia convergensCan biteSeven-spotted Lady BeetleSeven-spotted Lady BeetleCoccinella septempunctataCommon Pill WoodlouseCommon Pill WoodlouseArmadillidium vulgareHarmlessAsian Lady BeetleAsian Lady BeetleHarmonia axyridisCan biteHouse Mosquito ComplexHouse Mosquito ComplexCulex pipiensCan spread germs or diseaseBold Jumping SpiderBold Jumping SpiderPhidippus audaxCan biteBark Lice, Book Lice, and Parasitic LiceBark Lice, Book Lice, and Parasitic LicePsocopteraCan damage your homeSouthern House MosquitoSouthern House MosquitoCulex quinquefasciatusCan spread germs or diseaseInland Floodwater MosquitoInland Floodwater MosquitoAedes vexansCan spread germs or diseaseWestern Black WidowWestern Black WidowLatrodectus hesperusVenomousArgentine AntArgentine AntLinepithema humileNuisance, not dangerousEuropean Paper WaspEuropean Paper WaspPolistes dominulaCan stingThripsThripsThysanopteraCan biteWestern YellowjacketWestern YellowjacketVespula pensylvanicaCan stingWinter Marsh MosquitoWinter Marsh MosquitoCuliseta inornataCan biteSpotted Cucumber BeetleSpotted Cucumber BeetleDiabrotica undecimpunctataDamages trees, gardens or cropsBrown WidowBrown WidowLatrodectus geometricusCan biteHarlequin BugHarlequin BugMurgantia histrionicaDamages trees, gardens or cropsAmerican Winter AntAmerican Winter AntPrenolepis imparisWoodlouse SpiderWoodlouse SpiderDysdera crocataCan biteFalse Black WidowFalse Black WidowSteatoda grossaCan biteWestern Conifer Seed BugWestern Conifer Seed BugLeptoglossus occidentalisDamages trees, gardens or crops

Most reported bugs

Senecio Gall FlySenecio Gall FlySphenella fascigeraPriest CicadaPriest CicadaSinfonia opaliferaDead-nettle Leaf BeetleDead-nettle Leaf BeetleFasta fastuosaDotted Paropsine Leaf BeetleDotted Paropsine Leaf BeetleParopsis atomariaDamages trees, gardens or cropsAustralian CockroachAustralian CockroachValidiblatta australasiaeCommon Mime SwallowtailCommon Mime SwallowtailPapilio clytiaButterfliesButterfliesIpana junctilineaEurasian White AdmiralEurasian White AdmiralLimenitis camillaTripartite Sweat BeeTripartite Sweat BeeHalictus tripartitusMonarchMonarchDanaus plexippusYellow-faced Bumble BeeYellow-faced Bumble BeeBombus vosnesenskiiFine striped sweat beeFine striped sweat beeAgapostemon subtiliorRed Cone Gall WaspRed Cone Gall WaspFeron kingiOak Petiole Gall WaspOak Petiole Gall WaspAndricus quercuspetiolicolaCrystalline Gall WaspCrystalline Gall WaspFeron crystallinumDisc Gall WaspDisc Gall WaspFeron parmulaSaucer Gall WaspSaucer Gall WaspFeron gigasConvoluted Gall WaspConvoluted Gall WaspAndricus confertusClustered Gall WaspClustered Gall WaspAndricus brunneusLobed oak gall waspLobed oak gall waspAndricus quercusstrobilanusClustered Midrib Gall WaspClustered Midrib Gall WaspAndricus dimorphusTwo-form Bumble Bee ComplexTwo-form Bumble Bee ComplexBombus bifariusPainted LadyPainted LadyVanessa carduiWhite-lined SphinxWhite-lined SphinxHyles lineataDamages trees, gardens or cropsSmall WhiteSmall WhitePieris rapaeFiery SkipperFiery SkipperHylephila phyleusDamages trees, gardens or cropsSonoran Tiger MantisSonoran Tiger MantisStagmomantis clauseniArizona MantisArizona MantisStagmomantis limbataBlack-tailed Bumble BeeBlack-tailed Bumble BeeBombus melanopygusVivid DancerVivid DancerArgia vividaMourning CloakMourning CloakNymphalis antiopaDamages trees, gardens or cropsHunt's Bumble BeeHunt's Bumble BeeBombus huntiiWestern Tiger SwallowtailWestern Tiger SwallowtailPapilio rutulusVariable CheckerspotVariable CheckerspotEuphydryas chalcedonaVariegated MeadowhawkVariegated MeadowhawkSympetrum corruptumAnise SwallowtailAnise SwallowtailPapilio zelicaon

How this page works

All states in this region. House pests first.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.