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All photographs used on this site are copyrighted and permission to use them must be obtained by Richard Arnold


We are a Northern California-based consulting firm assisting the public and private sectors in environmental and technical matters that deal with insects and other invertebrates. Our special expertise is rare and endangered species of insects and invertebrates, in particular those that occur in the western United States.


A computerized database of approximately 300 endangered, candidate, and rare invertebrates that occur in California.

A DOS-based computer program for the analysis of capture-recapture data of open populations.

The California Oak Disease and Arthropod host index database with comprehensive, computerized compilations of the many agents that affect oaks in California.

Address: 104 Mountain View Court Pleasant Hill, CA 94523-2188
Phone: 925.825.3784 • Fax: 925.827.1809

Photo by: Jim Ebner

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