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July, 1910 LATE SPRING IN LAKE VALLEY 131 Thick-billed Sparrow (Passerella iliaca megarhyncha)and the Green-tailed Towhee (Oreospiza chlorura); but I was not successful in locating any nests of either species. By daybreak on May 30 I was on the road for the trip to Cave Rock and back. A tramp of 20 miles takes up the best part of a day to say nothing of the stops en route incidental to the study of ornithology. Near Edgewood two nests of the Western Robin were found which will illustrate the wide variation in nesting dates which I have found to prevail in the Sierras as it does almost everywhere, l?ig..12. NEST, i/? $i[l?, OF THE RUBV-CROI,VNED KINGLET; NEAR LAKE TAHOE Photo by Oluf J. Heinemann and shows the fallacy of basing any laid-down rule for nesting dates on the finding of a few nests. One of the two nests above referred to contained a single fresh egg while the other held three large young. Not far from Cave Rock the booming of grouse resounded everywhere thru the woods, but I did not see any of them altho I scanned tree after tree. Cave Rock, a bold, rocky cliff jutting into the lake, was the site of an occupied hawk's nest on my last visit; so it was with a feeling of expectation that I approacht it, but neither the hawks nor their nests were to be seen. In exploring the shallow cave which