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 208 THE CONDOR Vol. XX over entire surfaee with fine to larger spots of brownish gray, heaviest on lar- ger end. (See .fig. 43.) MEASUREMENTS IN INCHES For comparison only, I include in the photograph (fig. 43) set no. 4, of two Canada Jay eggs taken with one newly hatched chick in South Dakota, alti- tude 4,400 feet, April 21, 1918. Set no. 1 Set no. 2 Set no. 3 Set no. 4 1.26x.83 1.15x.85 1.20x.90 1.10x.78 1.26x.85 1.24x.85 1.29x.83 1.15x.77 1.20x.86 Fig. 45. NEST OF CANADA JAY, TAKEN IEAR NEMO, SOUTH DAKOTA, APRIL 21, 1918. 'lHe author is greatly indebted to ir. Smith Piley of Denver, as well as to his field assistants and also to ir. lt i. Watson, an experieneed oologist, for their interest and eo/Jperation in seeuring eggs, nests, and data on the habits of the Roeky iountain Jay and takes this opportunity of expressing grateful appreeiation of their efforts in behalf of the Colorado iuseum of Natural History. Photographs of the nests and eggs are by J. D. Figgins. Denver, Colorado July 9 1918.