List of butterflies on Block Island
| Phylo | Hodges | Family | Subfamily | Tribe | Species | Common Name | Abundance |
|---|---|---|---|---|---|---|---|
| 770006.00 | 3870 | Hesperiidae | Eudaminae | Epargyreus clarus | Silver-spotted Skipper | ||
| 770099.00 | 3959 | Hesperiidae | Pyrginae | Erynnini | Erynnis baptisiae | Wild Indigo Duskywing | |
| 770151.00 | 4004 | Hesperiidae | Hesperiinae | Thymelicini | Ancyloxypha numitor | Least Skipper | |
| 770218.00 | 4023 | Hesperiidae | Hesperiinae | Hesperiini | Hesperia leonardus leonardus | Leonard's Skipper | |
| 770232.00 | 4036 | Hesperiidae | Hesperiinae | Hesperiini | Polites peckius | Peck's Skipper | |
| 770236.00 | 4041 | Hesperiidae | Hesperiinae | Hesperiini | Polites themistocles | Tawny-edged Skipper | |
| 770239.00 | 4043 | Hesperiidae | Hesperiinae | Hesperiini | Polites mystic | Long Dash | |
| 770245.00 | 4049 | Hesperiidae | Hesperiinae | Hesperiini | Atalopedes campestris | Sachem | |
| 770249.00 | 4059 | Hesperiidae | Hesperiinae | Hesperiini | Poanes hobomok | Hobomok Skipper | |
| 770250.00 | 4060 | Hesperiidae | Hesperiinae | Hesperiini | Poanes zabulon | Zabulon Skipper | |
| 770301.00 | 4159 | Papilionidae | Papilioninae | Papilionini | Papilio polyxenes | Black Swallowtail | |
| 770316.00 | 4176 | Papilionidae | Papilioninae | Papilionini | Papilio glaucus | Eastern Tiger Swallowtail | |
| 770340.00 | 4209 | Pieridae | Coliadinae | Colias philodice | Clouded Sulphur | ||
| 770341.00 | 4210 | Pieridae | Coliadinae | Colias eurytheme | Orange Sulphur | ||
| 770362.00 | 4228 | Pieridae | Coliadinae | Phoebis sennae | Cloudless Sulphur | ||
| 770392.00 | 4197 | Pieridae | Pierinae | Pierini | Pieris rapae | Cabbage White | |
| 770401.00 | 4251 | Lycaenidae | Lycaeninae | Lycaena phlaeas | American Copper | ||
| 770432.00 | 4275 | Lycaenidae | Theclinae | Eumaeini | Satyrium titus | Coral Hairstreak | |
| 770480.00 | 4336 | Lycaenidae | Theclinae | Eumaeini | Strymon melinus | Gray Hairstreak | |
| 770510.00 | 4361 | Lycaenidae | Polyommatinae | Cupido comyntas | Eastern Tailed-Blue | ||
| 770514.00 | 4363 | Lycaenidae | Polyommatinae | Celastrina ladon | Spring Azure | ||
| 770517.00 | 4363.7 | Lycaenidae | Polyommatinae | Celastrina neglecta | Summer Azure | ||
| 770588.00 | 4614 | Nymphalidae | Danainae | Danaini | Danaus plexippus | Monarch | |
| 770593.00 | 4522 | Nymphalidae | Limenitidinae | Limenitidini | Limenitis arthemis astynax | Red-Spotted Purple | |
| 770608.00 | 4447 | Nymphalidae | Heliconiinae | Argynnini | Euptoieta claudia | Variegated Fritillary | |
| 770672.00 | 4434 | Nymphalidae | Nymphalinae | Nymphalini | Vanessa virginiensis | American Lady | |
| 770673.00 | 4435 | Nymphalidae | Nymphalinae | Nymphalini | Vanessa cardui | Painted Lady | |
| 770675.00 | 4437 | Nymphalidae | Nymphalinae | Nymphalini | Vanessa atalanta | Red Admiral | |
| 770680.00 | 4432 | Nymphalidae | Nymphalinae | Nymphalini | Nymphalis antiopa | Mourning Cloak | |
| 770681.00 | 4420 | Nymphalidae | Nymphalinae | Nymphalini | Polygonia interrogationis | Question Mark | |
| 770682.00 | 4421 | Nymphalidae | Nymphalinae | Nymphalini | Polygonia comma | Comma | |
| 770693.00 | 4440 | Nymphalidae | Nymphalinae | Junoniini | Junonia coenia | Common Buckeye | |
| 770741.00 | 4481 | Nymphalidae | Nymphalinae | Melitaeini | Phyciodes tharos | Pearl Crescent | |
| 770742.00 | 4481.1 | Nymphalidae | Nymphalinae | Melitaeini | Phyciodes cocyta | Northern Crescent | |
| 770770.00 | 4587 | Nymphalidae | Satyrinae | Satyrini | Cercyonis pegala | Common Wood Nymph |