Flower-Visiting Insects
of Pasture Thistle


Cirsium discolor (Pasture Thistle)
(Long-tongued bees collect pollen or suck nectar; short-tongued bees collect pollen & are non-pollinating; Syrphid flies and beetles feed on pollen & are non-pollinating; the Ichneumon wasp is probably exploring the flowers for nectar; other insects and humminbirds suck nectar; observations are from Robertson, Reed, Moure & Hurd, Hilty, Williams, and Tartaglia as indicated below)

Birds
Trochilidae: Archilochus colubris sn (H)

Bees (long-tongued)
Apidae (Bombini): Bombus auricomus sn cp fq (Rb, Re), Bombus fervida (Re), Bombus fraternus sn cp (Rb), Bombus griseocallis sn (Rb, Re), Bombus impatiens sn cp (Rb, Re), Bombus pensylvanica sn cp fq (Rb, Re), Bombus vagans (Re), Psithyrus variabilis sn fq (Rb); Anthophoridae (Anthophorini): Anthophora terminalis (Re); Anthophoridae (Ceratinini): Ceratina sp. (Re); Anthophoridae (Emphorini): Melitoma taurea sn (Rb); Anthophoridae (Epeolini): Triepeolus concavus sn (Rb); Anthophoridae (Eucerini): Melissodes agilis sn (Rb, Re), Melissodes coloradensis sn cp (Rb), Melissodes communis sn (Rb), Melissodes desponsa sn cp fq olg (Rb, Re), Svastra obliqua obliqua sn cp fq (Rb, Re); Megachilidae (Megachilini): Megachile latimanus sn cp fq (Rb, Re), Megachile relativa (Re)

Bees (short-tongued)
Halictidae (Halictinae): Agapostemon virescens (MH), Halictus confusus (MH), Halictus ligatus cp np, Lasioglossum imitatus cp np (Rb), Lasioglossum lineatulus (Re), Lasioglossum pruinosus cp np (Rb), Lasioglossum rohweri (Re), Lasioglossum versatus cp np (Rb), Lasioglossum zephyrus (Re); Colletidae (Colletinae): Colletes eulophi cp np (Rb); Colletidae (Hylaeinae): Hylaeus sp. (Re)

Wasps
Ichneumonidae: Temelucha ferrugineus exp np (Re)

Flies
Syrphidae: Epistrophe emarginata fp np (Re), Toxmerus marginatus fp np (Re); Bombyliidae: Exoprosopa fasciata sn (Rb), Systoechus vulgaris sn (Rb)

Butterflies
Nymphalidae: Danaus plexippus sn (Rb, H), Speyeria cybele sn (Rb), Speyeria idalia sn (Rb), Vanessa cardui sn (Rb, H); Pieridae: Colias eurytheme sn (H), Phoebis sennae sn (Rb); Papilionidae: Papilio cresphontes sn (Rb), Papilio polyxenes asterias sn (Rb, H)

Skippers
Hesperiidae: Hesperia leonardus pawnee sn (Re)

Moths
Sphingidae: Hemaris diffinis sn (Trt), Hemaris thysbe sn (Rb, Trt), Hyles lineata sn (Rb)

Beetles
Cantharidae:
Chauliognathus pennsylvanicus (Wms); Chrysomelidae: Diabrotica longicornis fp np (Rb)


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