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Species Leptoglossus occidentalis - Western Conifer Seed Bug

Western Conifer Seed Bug - Leptoglossus occidentalis Western Seed Conifer - Leptoglossus occidentalis Western Conifer Seed Bug - Leptoglossus occidentalis Western Conifer Seed Bug? - Leptoglossus occidentalis Nematopini Leaf-footed Bug? - Leptoglossus occidentalis hemipteran - Leptoglossus occidentalis Western Conifer seedbug - Leptoglossus occidentalis Pennsylvania True Bug - Leptoglossus occidentalis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Pentatomomorpha
Superfamily Coreoidea (Leatherbugs)
Family Coreidae (Leaf-footed Bugs)
Subfamily Coreinae
Tribe Anisoscelini
Genus Leptoglossus
Species occidentalis (Western Conifer Seed Bug)
Other Common Names
Pine Seed Bug
Explanation of Names
Leptoglossus occidentalis Heidemann 1910
15-20 mm
Dull reddish-brown with faint (or absent) white zigzag stripe across hemelytra; antennae may be almost as long as body. Outer hind tibial dilation nearly equal in length to inner dilation.
Native to w. NA, spreading eastward since the 1950s(1), now common throughout ne. US and so. ON(2) (reached so. NB)
recently introduced to Europe (first record: Italy 1999) and now widespread there(1)
Coniferous trees; adults may wander indoors late in the season looking for shelter to spend the winter
Nymphs and adults on conifers in spring and summer; adults often seen around homes during fall/winter
sap from green cones, twigs, seed pulp, and sometimes needles of Pinaceae (pines, hemlock, spruce, Douglas-fir)
Life Cycle
One generation per year. In spring the bugs move to conifers and feed on the developing seeds and early flowers. Females lay rows of eggs on host needles; eggs hatch in ~10 days and nymphs begin to feed on tender cone scales and sometimes the needles; 5 nymphal instars; adults appear by late August and feed on ripening seed.(3)
Generally does not bite/sting, but has been recorded (see references)
Not known to infect people or pets, damage property, or even reproduce indoors(4)
Gives off a pungent odor as defense if molested
See Also
in L. corculus, outer metatibial dilation distinctly longer than inner one, and posterior margin of genital capsule has median roundly V-shaped notch (subrectangular in L. occidentalis)
Works Cited
1.Alien terrestrial arthropods of Europe
Roques A., Kenis M., Lees D., Lopez-Vaamonde C., Rabitsch W., Rasplus J.-Y., Roy D., eds. 2010. BioRisk 4 Special Issue; 2 vols., 1028 pp.
2.Heteroptera of economic importance
Schaefer C.W., Panizzi A.R. (eds). 2000. CRC Press, Boca Raton, FL, 828 pp.
3.Cornell Insect Diagnostic Lab factsheets
4.Iowa insect information notes
5.Penn State Entomology