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Nov., [9o?. I THE CONI)OR 165 Cont0pus borealis. Olive-sided Flycatcher. A common species all through the Sierras, its shrill notes from the tall, dead trees marking its presence every- where. The birds are very cautious after nesting has commenced and its requires vigilance to detect either bird at the nest. The male will sit in one place seldom varying its monolonous note for even an hour at a time, if it finds it is observed, and now and then a low chuckle from the female on her nest is the only response, PHOTOGRAPHING AN OLII/E-$;IDED FLYCATCHER'S NE$;T 70 FEET UP IN $;ILVER FIR. but too ventriloquistic to expose the location of the nest. The nests are completed at Fyffe by lune ] and contain fresh eggs until about the middle of June. I collected a nest on June ?o x897 from a fir tree, the nest being 72 feet from the ground on a horizontal limb. The nest was composed of rootlets with which was mixed a quantity of a bright yellow dry moss (Ez,ernia vulpina) so common in the Sierras, and contained four eggs, one third incubated. This nest afforded an opportunity to attempt aerial photography with fair results. The birds were very pugnacious whale I was in the tree, flying about with a lively snapping of beaks. June ?4, x897 Mr. Carriger found a nest in a Douglas spruce 72 feet up. This contained four eggs, but owing to the droop of the limb and the distance of the nest from the trunk of the tree it could not be reached. A scoop was tried but efforts to secure the eggs proved unsuccessful. The average heights of nests of