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]'uly, 1914 ON THE OOLOGY OF THE PYGOPODES 173 Fig. 51. Nos..? AND 6, EGGS OF MEXICAN GREBE (Colymbus d. brachy- pierus); NOS. 7 AND 8, EARED GREBE (C. n. californicus); ?os. 9 A?D 10, PIED-BILLED GREBE (Podilymbus lkodiceps); ALL NAtrURAL SIZE.
