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 lO 4 BULLETIN OF TIlE COOPER ORNITHOLOGICAL CLUB. fi-om the first of July until the 5th of August. All the nests I know of were placed in sycamore trees along a creek in the bed of a canon, at from 5,ooo to 7,0o0 feet elevation. As a rule the cavities are large enough to admit the hand without enlarging, and vary from six inches to one foot in depth, and the distance from the ground ranges front twenty-five to fifty feet. The nest in the illustration was taken by Mr. W. B. Judson on our trip in 896, on July 6. It was placed in a sycamore tree about forty feet up in a natural cavity ten inches deep. This nest was within a stone's throw of our camp and was not found until two of the three eggs had been laid. We had seen the birds in the vicinity several times, but our suspicions had not in any way been aroused by their actions and we paid little attention to them until Mr. Judson happened to see the female fly from the cavity and thus xve found the nest. All the nests I have exam- ined were made entirely of stems of wild black walnut leaves without any attempt at lining whatever, excepting that the finer stems were plaeed on the inside of the nest. OLIVACEOUS The Olivaceous Flycatcher is a com- mon summer resident in various moun- tain ranges of Arizona and New Mexi- co. It is found very commonly in the oak belt in the Huachuca and Santa Rita mountains at from 5,000 to 7,00o feet elevation. Although the birds are so numerous, the nests are very hard to find. During four seasons' collecting in these mountains I kept a sharp lookout for the nests of this bird but until this season I did not secure a single egg. In the season of '96 we spent many hours watching the birds in hope of finding a set or two of their eggs, but were only rewarded with a nest of four young birds about ten days old. This nest was in an ash tree within three feet of a trail on which we were passing aI- 'most daily. It was placed in a natural cavity about twenty feet up and ten inches below the entrance. We had seen the birds in the vicinity of this nest and watched them several times but no't once did the birds cause the A set of three slightly incubated eggs found,Aug. 5, 897, by Mr. F. C. Wil- lard of Galesburg, II1., was placed in a sycamore, fifty feet up, in a naturaI cavity in the trunk of the tree and about ten inches deep. This nest was directly over a creek. A nest which I found this season (on July 20, 899) contained two young of this species just hatched. The nest was placed in a natural cavity in a sycamore about forty feet up and was the same cavity from which I secured a fine sef of young in 897. The nests are very large, with a shallow cup, measuring about three inches, inside diameter. The out- side diameter varies according to the size of the cavity in which the nest is placed. Notwithstanding the crude material used in the composition of the nests they are rather compact and eas- ily preserved. I have no calipers with me so cannot give the dimensions of the eggs, but they are about the size of a Kingbird's or slightly larger, rather oval in shape and marked over the en- tire shell with scratches and blotches of chestnut and reddish-crown with under shelI markings of purple, the ground color being a shiny buff. FLYCATCHER. least suspicion as to the Iocation of their nest until Mr. Judson espied the female with food for the young and saw her go to the nest. In 897 I noticed a pair of these birds in a certain locaIity several times and made up my mind they were about to build in the vicinity, so I placed some cotton aIong a barbed wire fence and watched results. The birds did not bite that day, but a day or two af- ter I came back to the same pIace and noticed that some of the cotton had dis-. appeared, so I sat down to watch and it was not Iong before one of the fly- catchers lit on the fence and took a good sized piece of cotton and flew off to where its mate was perched, drop- ping the cotton on the way. I watched the birds for fully an hour after this but there was no further attempt made at gathering building material. By mere accident a friend secured a single egg of this species for me last season. My friend had climbed an ash