| 8430 | quadralis Barnes & McDunnough, Parahypenodes | 930667 | |
| 10925 | quadrangula Zetterstedt, Rhyacia, [Agrotis] | 933548 | |
| 10430 | quadrannulata Morrison, Dargida, [Mamestra] | 932927 | |
| quadranotata Strecker, Grammia, [Arctia] | 930254 | |
| 10310 | quadrata Smith, Papestra, [Mamestra] | 932892 | |
| 9044.2 | quadrata Ferris & Lafontaine, Marimatha | 931286 | |
| 9224 | quadrata Grote, Acronicta, [Acronycta] | 931441 | |
| quadrata Smith, Papestra– ssp., [Mamestra] | 932892 | |
| quadrate Smith, Emarginea, [Cyathissa] | 931606 | |
| 10927.2 | quadricava Lafontaine, Spaelotis | 933559 | |
| 10830 | quadridentata Grote & Robinson, Euxoa, [Agrotis] | 933455 | |
| quadridentata Grote & Robinson, Euxoa– ssp., [Agrotis] | 933455 | |
| 9003 | quadrifera Zeller, Tripudia, [Erastria] | 931260 | |
| 8762 | quadrifilaris Hübner, Argyrostrotis, [Agnomonia] | 930954 | |
| quadriguttalis Hübner, Alypia | 931979 | |
| 10422 | quadrilineata Grote, Lacinipolia, [Mamestra] | 933075 | |
| 10335 | quadrilunata Grote, Lasionycta, [Anarta] | 932995 | |
| quadrilunata Grote, Lasionycta– ssp., [Anarta] | 932995 | |
| quadrimaculata Strand, Euproctis, [Porthesia] | 930172 | |
| 9142 | quadriplaga Smith, Tarache, [Acontia] | 931353 | |
| quadriplaga Walker, Syngrapha, [Plusia] | 931233 | |
| quadriposita Zetterstedt, Papestra, [Hadena] | 932893 | |
| 8500 | quadrisignata Walker, Metalectra, [Homoptera] | 930680 | |
| quadristigma Smith, Anhimella, [Himella] | 933086 | |
| quaesita Draudt, Nystalea | 930122 | |
| quaesita Grote, Apamea, [Hadena] | 932319 | |
| Quandara Nye | 930656 | |
| quarta Grote, Adelphagrotis, [Agrotis] | 933640 | |
| quatiens Walker, Ephyrodes, [Zethes] | 931083 | |
| 10714 | quebecensis Smith, Euxoa, [Setagrotis] | 933328 | |
| quechua Franclemont, Mythimna, [Pseudaletia] | 932935 | |
| 8172 | quenseli Paykull, Grammia, [Bombyx] | 930250 | |
| quercus Boisduval, Pseudohemihyalea, [Phoegoptera] | 930381 | |
| 9904 | querquera Grote, Lithophane | 932550 | |
| 10894 | querula Dod, Protogygia, [Rhizagrotis] | 933296 | |
| 10985 | quieta Hübner, Xestia, [Noctua] | 933613 | |
| quinaria Grote, Virbia, [Crocota] | 930306 | |
| quinquefasciata Smith, Orthosia– ssp., [Taeniocampa] | 932778 | |
| quinquelinea Smith, Euxoa, [Agrotis] | 933341 | |
| quinquelinea Dyar, Gluphisia– ssp. | 930019 | |
| quinta Smith, Euxoa | 933328 | |
| 9329.1 | quinteri Mikkola & Lafontaine, Apamea | 932301 | |
