Essig, E.O. 1928 Some insects of the Yosemite National Park.. The Pan-Pacific Entomologist 5: 76-78.

Notes: List of insects recorded include: Eriococcus borealis, Lecanium quercitronis, L. corni, Physokermes concolor, Lepidosaphes ulmi, L. ceanothi, Chionaspis pinifoliae, Ch. salicis-nigrae, Dinaspis kelloggi, Aspidiotis densiflorae and A. pini; hosts; ecological notes.