Sium suave (Water Parsnip)
(Bees suck nectar or collect pollen, other insects suck nectar; most observations are from Robertson, otherwise they are from Graenicher as indicated below)
Bees (long-tongued)
Apidae (Apinae): Apis mellifera sn; Apidae (Bombini): Bombus impatiens cp, Bombus pensylvanica cp; Anthophoridae (Eucerini): Melissodes agilis sn
Bees (short-tongued)
Halictidae (Halictinae): Halictus confusus sn, Halictus ligatus sn, Halictus rubicunda sn, Lasioglossum cinctipes sn, Lasioglossum coriaceus sn, Lasioglossum illinoensis sn, Lasioglossum imitatus sn, Lasioglossum truncatus sn, Lasioglossum versatus sn cp, Lasioglossum zephyrus sn; Halictidae (Sphecodini): Sphecodes dichroa sn, Sphecodes stygius sn fq; Colletidae (Colletinae): Colletes americana sn, Colletes eulophi sn; Colletidae (Hylaeinae): Hylaeus affinis sn, Hylaeus mesillae sn, Hylaeus modestus modestus sn
Wasps
Sphecidae (Bembicinae): Hoplisoides placidus, Pseudoplisus phaleratus, Stizus brevipennis, Synnevrus plagiatus, Zanysson plesia; Sphecidae (Crabroninae): Ectemnius atriceps fq, Ectemnius continuus, Ectemnius lapidarius fq, Ectemnius trifasciatus, Lestica confluentus, Lindenius columbianus fq, Oxybelus emarginatus fq, Oxybelis frontalis fq, Oxybelus niger, Oxybelus packardii, Oxybelus uniglumis fq; Sphecidae (Larrinae): Ancistromma distincta, Liris argentata fq, Lyroda subita, Tachysphex terminata, Tachytes distinctus, Trypoxylon clavatus; Sphecidae (Philanthinae): Cerceris bicornuta, Cerceris clypeata, Cerceris echo, Cerceris finitima, Cerceris kennicottii, Cerceris prominens, Philanthus gibbosus; Sphecidae (Sphecinae): Ammophila kennedyi, Chalybion californicus, Chlorion aerarius, Eremnophila aureonotata, Isodontia apicalis, Prionyx thomae, Sceliphron caementaria; Scoliidae: Scolia bicincta; Tiphiidae: Methoca stygia, Myzinum quinquecincta; Sapygidae: Sapyga interrupta; Pompilidae: Ageniella acceptus, Ageniella longulus, Anoplius atrox, Anoplius lepidus, Anoplius marginatus, Anoplius nigritus, Anoplius tenebrosus, Ceropales maculata, Episyron biguttatus, Evagetes parvus; Bethylidae: Goniozus cellularis; Mutillidae: Dasymutilla macra, Myrmosula parvula; Chrysididae: Caenochrysis doriae, Chrysis nitidula, Holopyga ventrale; Eucoilidae: Eucoila erythropus, Eucoila impatiens, Eucoilidea canadensis, Kleidotoma americana, Pseudeucoila mellipes fq; Figitidae: Figites impatiens, Neralsia armatus; Chalcididae: Brachymeria ovata, Conura debilis, Haltichella onatas, Haltichella xanticles; Elasmidae: Elasmus nigripes; Eurytomidae: Bruchophagus gibba, Eurytoma sp.; Leucospididae: Leucospis affinis; Perilampidae: Syntomopus americanus; Pteromalidae: Callitula cyrnus; Ichneumonidae: Cryptus mundus, Cryptus persimilis, Diadegma pattoni, Ichneumon ambulatorius, Trathala delicatus; Braconidae: Chelonus sericeus, Microplites ceratomiae, Rhygoplitis terminalis, Vipio rugator; Vespidae: Polistes fuscata, Vespula germanica; Vespidae (Eumeninae): Ancistrocerus adiabatus, Ancistrocerus campestris, Eumenes fraterna, Euodynerus foraminatus, Leionotus scrophulariae (Rb, MS), Leionotus ziziae (Rb, MS), Monobia quadridens
Flies
Sciaridae: Sciara atrata; Tabanidae: Chrysops striatus; Stratiomyidae: Stratiomys meigenii; Empididae: Empis clausa; Syrphidae: Allograpta obliqua, Eristalinus aeneus, Eristalis tenax, Orthonevra nitida, Paragus tibialis, Platycheirus quadratus (Rb, Gr), Syritta pipiens, Syrphus ribesii, Toxomerus geminatus, Toxomerus marginatus, Toxomerus politus (Rb, Gr), Trichopsomyia banksi, Tropidia albistylum, Tropidia quadrata; Bombyliidae: Exoprosopa fasciata, Exoprosopa fascipennis, Sparnopolius confusus, Toxophora amphitea, Villa alternata (Rb, Gr); Tachinidae: Belvosia unifasciata, Chaetogaedia analis, Chetogena claripennis, Distichona varia, Doriella distincta, Euclytia flava, Gnadochaeta globosa, Gnadochaeta metallica, Gymnosoma fuliginosum, Lespesia aletiae, Leucostoma simplex, Linnaemya comta, Lixophaga variabilis, Panzeria aldrichi fq, Phasia purpurascens fq, Spallanzania hesperidarum, Trichopoda pennipes; Sarcophagidae: Amobia aurifrons, Amobia floridensis, Helicobia rapax, Ravinia derelicta, Ravinia stimulans fq, Sarcophaga africa, Senotainia rubriventris, Sphixapata trilineata fq; Calliphoridae: Calliphora splendida, Cochliomyia macellaria, Lucilia sericata, Phormia regina; Muscidae: Coenosia ovata, Graphomya americana, Limnophora narona, Morellia micans, Musca domestica, Neomyia cornicina, Stomoxys calcitrans; Anthomyiidae: Anthomyia leucostoma, Calythea nigricans; Fanniidae: Fannia incisurata, Fannia manicata; Otitidae: Euxesta notata; Tephritidae: Tomoplagia obliqua; Sepsidae: Themira putris; Ephydridae: Ochthera lauta prd; Chloropidae: Chlorops proximus, Liohippelates flavipes, Liohippelates pusio, Meromyza americana, Olcella cinerea; Milichiidae: Leptometopa latipes
Butterflies
Nymphalidae: Danaus plexippus, Libytheana carinenta; Lycaenidae: Celastrina argiolus, Parrhasius m-album; Pieridae: Pieris rapae
Beetles
Cantharidae: Chauliognathus pennsylvanicus, Silis bidentatus; Chrysomelidae: Acalymma vittata, Acanthoscelides obsoletus, Althaeus hibisci, Diabrotica longicornis, Diabrotica undecimpunctata, Megacerus discoidus; Coccinellidae: Coleomegilla maculata, Cycloneda sanguinea; Curculionidae: Centrinaspis picumna; Dermestidae: Attagenus megatoma; Lampyridae: Photinus pyralis; Meloidae: Epicauta pensylvanica; Melyridae: Collops quadrimaculatus; Mordellidae: Hoshihananomia octopunctata, Mordella marginata, Mordella melaena; Scarabaeidae: Euphoria sepulcralis
Plant Bugs
Anthocoridae: Orius insidiosus; Lygaeidae: Lygaeus turcicus; Miridae: Lopidea medius fq; Thyreocoridae: Corimelaena pulicarius