Frequency of Species Ten piles of cuttings occurrence _Agropyron repens_ 1 0 0 2 0 0 6 19 0 4 13 _Poa annua_ 0 0 0 0 0 0 0 0 0 0 00 _Bromus carinatus_ 0 0 0 0 0 10 0 0 0 0 04 _Bromus inermis_ 0 0 0 0 0 0 0 0 0 0 00 _Medicago sativa_ 40 14 30 30 31 5 0 0 21 4 73 _Lepidium densiflorum_ 0 0 0 0 0 0 0 0 0 0 00 _Galium aparine_ 0 0 0 0 1 0 1 0 0 0 01 _Lactuca scariola_ 6 2 1 2 5 0 0 0 2 4 09 [Footnote A: Analysis made on May 12, 1946, on an area 20 × 80 yards, at Lawrence, Kansas.] [Footnote B: Each of the first ten vertical columns gives the composition of one pile of cuttings. The last column gives the percentage of occurrence in the piles of cuttings of each species of plant in the area. Place and date for data in table 2 same as for table 1.] Approximately one out of every ten voles caught in snap traps had a piece of plant in its mouth. Occasionally a vole took a piece of food into a live trap. Evidently the food is not always eaten where it is procured. Grasses of the genus _Poa_ are the kinds most frequently found in the mouths of dead voles. _Bromus carinatus_, _B. inermis_ and sweet clover (_Melilotus alba_) were found in the runways. The pulpy fruit of the horse nettle (_Solanum carolinense_) was found partly eaten, especially near the entrances to underground passages. FOOD CACHES Caches of seeds and underground parts of plants are stored in subterranean chambers. One lot of food was found stored on the surface of the ground. Four times, piles of seeds in runways indicated the species of plants which the voles were storing. One underground cache was found on May 27, 1946, on the University campus, by John Evans, Richard Edgar, and the writer. This cache was in a large chamber in a tunnel system of the prairie vole, on an east-facing hillside of walnut trees, catalpas, and Kentucky coffee trees. The oval chamber was 250 mm. wide, 400 mm. long, and 200 mm. high. The roof, at its highest point, was 30 mm. below the surface of the ground. There were two entrances to the cavity, both on the downhill side. The cache consisted of eight quarts of seeds (approximately 2,800) of the Kentucky coffee tree (_Gymnocladus dioica_). The seeds were packed with earth and all were well preserved. The site of this cache was in an area which was shaded by a small coffee tree. A seed of this tree is spheroidal, measures 17 mm. in width, and weighs 2 grams.