COLLECTING POCKET GOPHERS 1. Specimens should be secured from as many environ- mental set-ups -- soil textures, elevations, plant associations -- as possible in the available time. Especially should this be so in the case of type local- ities. 2. Notes as to color and general texture of soil should be so arranged that the individual specimens may be classified in this regard. It is perhaps best to write such notes, abbreviated, on the tag as well as in the notebook. 3. Rather than large series from any one locality (unless it be in an entirely new differentiation area), it is better to have samples (=5 adult females, 3 adult males, if possible) from a number of close-together localities. 4. Trap settings (exact places) should be marked on the maps to be kept permanently in notebooks, concorded with the written records of catch and descriptions of ground. 5. If a population of gophers appears variable on first sampling, attempt to get a series of ten or more adult females, together with the males taken at the same time whatever their number. 6. Save skulls of any young taken; but series of skins in juvenile pelage are of little importance. Save complete skeletons of any very young ones taken, or preserve entire in alcohol. Skeletons or specimens of adults are not needed beyond two of a kind (♂ and ♀) unless for special studies known to be actually under way.