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 Sept.,1918 NOTES ON THE NESTING OF THE MOUNTAIN PLOVER 163 The accompanying photograph by Mr. Figgins (see figure 32) is of the ,"our sets taken' in 1917. There is some variation, of course, in the ground color of the eggs; but such difference is fully as noticeable in eggs of the same set as between those of different sets. The following color description (Ridgway's Color Standards used) and measurements are by Mr. Lincoln, Curator of Ornithology, Colorado Museum cf Natural History. Ground color, olive buff to dark olive buff or light yel- 4 3 2 Fig. 32. Foug SETS,'OF TIIREE EGOS ]::ACII, OF iOU.A'TAIN PLO$'ER. %'ERTpUAL ROW OF EGG AS REFERRI:D TO IN TEXT 1 SETIq ARE NUMBERED, BY 1owish olive, heavily spotted with blackish brown interndxed with smaller and paler spots, sotnewhat confluent on the larger end, varying in individual eases. MEASUItEMENTS IN INCHES OF EGGS OF MOUNTAIN PLOVEll et no. 1 et no. 2 et no. 3 ' et no. 4 1.45x1.11 1.48x1.10 1.43x1.10 1.55x1.13 1.47x1.10 1.45x1.12 1.51x1.11 1.50x1.13 1.47x1.11 1.49x1.13 1.49x1.14 1.49x1.13 Dcnver Colorado March 1 1918.