These are all the species I’ve seen here in May. Each photo on this page was actually taken in May, and is linked to my page about that moth with more photos and information.
Abrostola urentis
Acasis viridata
Achatia distincta
Acronicta americana
Acronicta exilis
Acronicta fallax
Acronicta funeralis
Acronicta hasta
Acronicta impressa
Acronicta innotata
Acronicta interrupta
Acronicta lepusculina
Acronicta morula
Acronicta spinigera
Actias luna
Allagrapha aerea
Amorpha juglandis
Anagrapha falcifera
Anagrapha precationis
Anania tertialis
Anavitrinella pampinaria
Anicla forbesi
Antaeotricha leucillana
Antepione thisoaria
Anterastria teratophora
Antheraea polyphemus
Anticlea multiferata
Anticlea vasiliata
Argyrotaenia mariana
Argyrotaenia velutinana
Atteva aurea
Autographa precationis
Baileya doubledayi
Baileya opthalmica
Balsa tristrigella
Bellura obliqua
Besma endropiaria
Besma quercivoraria
Biston betularia
Caenurgina
Callopistria mollissima
Campaea perlata
Catabena lineolata
Cerastis tenebrifera
Charadra deridens
Chlorochlamys chloroleucaria
Cisseps fulvicollis
Cissusa spadix
Cladara atroliturata
Clostera albosigma
Clostera apicalis
Clostera strigosa
Cochylis temerana
Condica vecors
Condica videns
Copivaleria grotei
Costaconvexa centrostrigaria
Crambodes talidiformis
Crocigrapha normani
Cycnia collaris
Cycnia oregonensis
Darapsa choerilus
Darapsa myron
Dargida diffusa
Deidamia inscriptum
Depressaria pastinacella
Desmia funeralis
Desmia maculalis
Diacme adipaloides
Dichorda iridaria
Digrammia gnophosaria
Drepana arcuata
Drepana bilineata
Dyseriocrania griseocapitella
Dyspteris abortivaria
Dysstroma hersiliata
Ectropis crepuscularia
Elaphria versicolor
Ellida caniplaga
Elophila obliteralis
Endothenia hebesana
Epiblema scudderiana
Epirrhoe alternata
Euchlaena serrata
Euclidia cuspidea
Eudeilinia herminiata
Euphyia intermediata
Eupithecia
Eupithecia absinthiata
Eupithecia ravocostaliata
Euplexia benesimilis
Eupsilia
Eupsilia devia
Eupsilia morrisoni
Euthyatira pudens
Eutrapela clemataria
Furcula borealis
Furcula cinerea
Furcula modesta
Furcula occidentalis
Furcula scolopendrina
Galgula partita
Gluphisia septentrionis
Habrosyne gloriosa
Haematopis grataria
Harrisimemna trisignata
Hedya separatana
Helcystogramma fernaldella
Helcystogramma hystricella
Heterocampa guttivitta
Heterophleps refusaria
Heterophleps triguttaria
Homochlodes fritillaria
Horisme intestinata
Hydrelia albifera
Hydrelia lucata
Hydriomena
Hydriomena transfigurata
Hyles lineata
Hypena abalienalis
Hypena atomaria
Hypena baltimoralis
Hypena bijugalis
Hypena deceptalis
Hypena humuli
Hypena madefactalis
Hypenodes fractilinea
Hypercompe scribonia
Hyppa xylinoides
Idia aemula
Iridopsis larvaria
Isturgia dislocaria
Lacinipolia renigera
Lascoria ambigualis
Leucania
Leuconycta diphteroides
Leuconycta lepidula
Lithophane bethunei
Lithophane fagina
Lithophane semiusta
Lobophora nivigerata
Lomographa glomeraria
Lomographa vestaliata
Macaria aemulataria
Maliattha synochitis
Meganola minuscula
Melanchra adjuncta
Melanchra picta
Melanolophia signataria
Mesoleuca ruficillata
Metanema inatomaria
Metarranthis duaria
Metarranthis hypochraria
Morrisonia confusa
Morrisonia evicta
Mythimna unipuncta
Nadata gibbosa
Nedra ramosula
Nemoria mimosaria
Nerice bidentata
Ochropleura implecta
Olethreutes bipartitana
Orthonama obstipata
Orthosia alurina
Orthosia garmani
Orthosia hibisci
Orthosia rubescens
Ostrinia nubilalis
Pachysphinx modesta
Palpita magniferalis
Palthis angulalis
Paonias myops
Perispasta caeculalis
Pero ancetaria
Pero honestaria
Petrophora subaequaria
Phaeoura quernaria
Phalaenophana pyramusalis
Phaneta formosana species group
Pheosia rimosa
Phigalia strigataria
Phigalia titea
Phlogophora iris
Phoberia atomaris
Phosphila miselioides
Phragmatobia fuliginosa
Phyllodesma americana
Plagodis alcoolaria
Plagodis fervidaria
Plagodis phlogosaria
Plagodis pulveraria
Plagodis serinaria
Plusia contexta
Probole amicaria
Protitame virginalis
Protoboarmia porcelaria
Proxenus mendosa
Proxenus miranda
Psaphida electilis
Psaphida resumens
Psaphida rolandi
Pseudeustrotia carneola
Pyrausta generosa
Pyrausta orphisalis
Pyreferra pettiti
Pyrrharctia isabella
Raphia frater
Rheumaptera undulata/prunivorata
Rivula propinqualis
Sciota vetustella
Scoliopteryx libatrix
Scoparia biplagialis
Selenia kentaria
Simyra insularis
Smerinthus cerisyi
Smerinthus jamaicensis
Sphecodina abbottii
Sphinx kalmiae
Spilosoma congrua
Spilosoma latipennis
Spilosoma virginica
Spodolepis substriataria
Syndemis afflictana
Tetracis cachexiata
Tetracis crocallata
Thyris maculata
Trichodezia albovittata
Xanthorhoe ferrugata
Xanthorhoe lacustrata
Xanthotype sospeta/urticaria
Xestia c-nigrum/dolosa
Zale galbanata
Zale horrida
Zale minerea
Zale unilineata
