Species
*'' D. caseyi'' Blaisdell, 1930 *'' D. marginata'' (Casey, 1887) *'' D. sanfelipe'' Gillett, Osborne, Reil, & Rubinoff, 2020 In 2006, entomologists indicated that there were two apparently new species or subspecies of ''Dinacoma'', collected respectively from near the city of Hemet, California, and in the northwest portion of Joshua Tree National Park, California, at Covington Flats. As of 2022, these specimens of ''Dinacoma'' have not been formally described in the scientific literature, but expert evaluation places them in the ''Dinacoma marginata'' species group. stated that ''Dinacoma caseyi'' is the most morphologically divergent and distinct species in the genus. The new specimens collected from the Hemet area are paler than Casey's June beetle specimens and possess morphologically different genitalia. Furthermore, the Little San Bernardino Mountains geographically isolate the new ''Dinacoma'' Joshua Tree population from all other known ''Dinacoma'' species.Notes
References
* * *. Cited in Beetles of North America Melolonthinae Endemic fauna of California Fauna of the Colorado Desert {{Melolonthinae-stub