SUMMARY
Eight species of beetles are reported from ten previously unreported hypogeous fungus substrates. The associations include: Catopocerus capizzii with Hymenogaster parksii and Zelleromyces gilkeyae; C. cryptophagoides with Elaphomyces granulatus var. granulatus; C. ovatus with Hysterangium sp.; C. rothi with Hymenogaster parksii, Barssia oregonensis, Hysterangium sp., Martellia ellipsospora, Rhizopogon parksii, Truncocolumella citrina var. citrina, and Z. gilkeyae; C. subterraneus with M. vesiculosa; Nossidium sp. with Hymenogaster parksii; Thalycra concolor with Gautieria sp.; Hydnobius sp. (matthewsi?) with Gautieria sp. and Geopora cooperi f. gilkeyae; and Agonum sp. probably a predator of Hydnobius sp. (matthewsi?) in Gautieria sp.