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diameter). These early interim-version keys were demonstrated and discussed with opportunities for hands-on experimentation at three technical meetings in 2002: the 23rd Annual Recovery Program Researchers Meeting in Moab, Utah, 16-17 January; the annual meeting of the Colorado-Wyoming Chapter of the American Fisheries Society in Laramie, Wyoming, 26-27 February; and the 26th annual Larval Fish Conference in Bergen, Norway, 22-26 July. The interest generated in the keys, and computer-interactive keys in general, during these presentations and hands-on sessions was encouraging. Participant feedback, however, suggested that keys could be best improved by combining them into one key covering all developmental intervals. Accordingly, the separate data sets and keys were combined into one for later interim versions with either characters or taxa subdivided according to developmental interval and size. Near final versions of the data set and key were prepared with subdivided taxa, mostly because subdivided characters incurred more character-dependency problems (availability of certain characters depending on the character state selected for a controlling character-e.g., if yolk is not present, yolk-related characters should be made unavailable). Although Intkey can make extensive use of taxon and character-state-selection images, preparation and inclusion of such was neither critical for operation of the key nor logistically and budgetarily feasible for this project (if desired, they can be prepared and incorporated at some future date). Also, such images can require a considerable amount of storage memory and at times a strictly text key may be preferable, especially for the experienced user or when using a slower computer with limited memory. Instead, illustrations in Snyder and Muth (1990) and this report were extensively referenced, which means that both documents should be handy when using the key. However, as examples of how character-state-selection images function, such illustrations were prepared and included for three characters-developmental phase, standard length (SL), and phases of gut development. Interim and near fmal versions of the key were subjected to in-house testing, mostly in the routine processing ofUCRB collections, and refined accordingly. Although additional testing by outside researchers was originally planned, such was precluded by delays in completing the latest versions of the key. However, a near-final version was sent to M. Dallwitz for review. Further refinements of the key, beyond this project, will likely be implemented as needed based on reviews and user feedback, also as the key is further expanded or adapted for other regions and species. " An introduction to and instructions for installing and using the key were also prepared and reviewed in house. Results and Discussion These results amend, update, and complete the descriptions and keys for UCRB sucker larvae and early juveniles in the CDOW guide by Snyder and Muth (1990). Specific corrections and updates (due mostly to character range extensions) are listed immediately below. Based on those corrections and updates, as well as study of reared and collected longnose sucker, expanded updates of the "Comparative Summary" and "Keys" sections of that guide follow. A species account for longnose sucker comparable to those at the end of the guide is similarly provided at the end of this section, in part to maintain an internal sequence of tables and figures consistent with the guide. Except for replacement tables in the updated "Comparative Summary" and additional tables in the new species account, all table and figure references are to those in Snyder and Muth (1990). 15