The highly distinctive and diverse native Hawaiian carabid beetle fauna includes a suite of species not recently observed in nature. These are predominantly historical residents of the mesic Acacia koa forest formation. We report rediscovery of one of these species, Blackburnia anomala (Blackburn), in the shrubland formation near Paliku Cabin, and in koa forest of Kaupo Gap. Prior records of B. anomala are limited to the leeward edges of historical koa forest near Olinda, on the northwestern slope of Haleakala. Rediscovery on the far southeastern side of Haleakala Crater in similar, though conserved, habitats suggests that other long-missing koa associates may persist in similar situations on Haleakala.

The highly distinctive and diverse native Hawaiian carabid beetle fauna includes a suite of species not recently observed in nature. These are predominantly historical residents of the mesic Acacia koa forest formation. We report rediscovery of one of these species, Blackburnia anomala (Blackburn), in the shrubland formation near Paliku Cabin, and in koa forest of Kaupa Gap. Prior records of B. anomala are limited to the leeward edges of historical koa forest near Olinda, on the northwestern slope of Haleakala. Rediscovery on the far southeastern side of Haleakala Crater in similar, though conserved, habitats suggests that other long-missing koa associates may persist in similar situations on Haleakala. THE HAWAIIAN ISLANDS support two spe­ ciose radiations within the predaceous beetle family Carabidae. These are classified as species of the genera Blackburnia Sharp and Mecyclothorax Sharp. The endemic genus Blackburnia comprises 131 known species (Liebherr and Zimmerman 2000, Liebherr 2001, 2003), of which 97% are restricted to single islands. Even on the two-volcano island of Maui, only 4 of 47 resident Maui Black­ burnia are shared between Haleakala and the West Maui Mountains. The Hawaiian Archi­ pelago has been shown to be a crucial region for preservation of endangered plants, birds, and mollusks (Dobson et al. 1997), and the endemic nature of insect groups such as Blackburnia points out that Hawaiian insect distributions warrant a similar conservation effort across the full diversity of insect taxa as modern syntheses of taxonomic information