Insects & Arthropods of Illinois
The insects & arthropods most often spotted in Illinois, ranked by recent research-grade observations.
Most-observed insects & arthropods in Illinois
Common Eastern Bumble Bee
Bombus impatiens
23,236 observations
Monarch
Danaus plexippus
19,203 observations
Brown-belted Bumble Bee
Bombus griseocollis
18,294 observations
Western Honey Bee
Apis mellifera
15,455 observations
Eastern Carpenter Bee
Xylocopa virginica
9,408 observations
Asian Lady Beetle
Harmonia axyridis
9,335 observations
Black Swallowtail
Papilio polyxenes
9,174 observations
Two-spotted Bumble Bee
Bombus bimaculatus
8,654 observations
Eastern Tiger Swallowtail
Papilio glaucus
7,862 observations
Red Admiral
Vanessa atalanta
7,496 observations
Pearl Crescent
Phyciodes tharos
7,216 observations
Silver-spotted Skipper
Epargyreus clarus
6,813 observations
Common Buckeye
Junonia coenia
6,248 observations
Small White
Pieris rapae
5,904 observations
Large Milkweed Bug
Oncopeltus fasciatus
5,810 observations
Ligated Furrow Bee
Halictus ligatus
5,372 observations · iNaturalist
Red-spotted Admiral
Limenitis arthemis
5,005 observations
Eastern Tailed-Blue
Cupido comyntas
4,898 observations · iNaturalist
Common Whitetail
Plathemis lydia
4,632 observations
Bold Jumping Spider
Phidippus audax
4,376 observations
Painted Lady
Vanessa cardui
4,306 observations
Fiery Skipper
Hylephila phyleus
4,299 observations · iNaturalist
Red Milkweed Beetle
Tetraopes tetrophthalmus
4,246 observations
Black-and-gold Bumble Bee
Bombus auricomus
3,993 observations
Blue Dasher
Pachydiplax longipennis
3,979 observations
Ailanthus Webworm Moth
Atteva aurea
3,882 observations · iNaturalist
Japanese Beetle
Popillia japonica
3,840 observations
Eastern Pondhawk
Erythemis simplicicollis
3,791 observations
Widow Skimmer
Libellula luctuosa
3,709 observations
Hackberry Emperor
Asterocampa celtis
3,698 observations
Goldenrod Soldier Beetle
Chauliognathus pensylvanicus
3,679 observations · iNaturalist
Six-spotted Tiger Beetle
Cicindela sexguttata
3,513 observations
Pipevine Swallowtail
Battus philenor
3,476 observations
Isabella Tiger Moth
Pyrrharctia isabella
3,441 observations
Margined Calligrapher
Toxomerus marginatus
3,372 observations · iNaturalist
Eastern Forktail
Ischnura verticalis
3,362 observations
Spicebush Swallowtail
Papilio troilus
3,342 observations
Orange Sulphur
Colias eurytheme
3,338 observations
Brown Marmorated Stink Bug
Halyomorpha halys
3,276 observations
Differential Grasshopper
Melanoplus differentialis
3,228 observations
Carolina Mantis
Stagmomantis carolina
3,216 observations
Northern Paper Wasp
Polistes fuscatus
3,214 observations
Chinese Mantis
Tenodera sinensis
3,177 observations
Question Mark
Polygonia interrogationis
3,141 observations
Bald-faced Hornet
Dolichovespula maculata
3,118 observations
Peck's Skipper
Polites peckius
3,048 observations · iNaturalist
North American Wheel Bug
Arilus cristatus
2,851 observations
Zabulon Skipper
Lon zabulon
2,748 observations · iNaturalist
Green Cloverworm Moth
Hypena scabra
2,661 observations · iNaturalist
Viceroy
Limenitis archippus
2,603 observations