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234 THE CONDOR VoL. X ered young. This nest was in Carr Canyon and was placed at the top of a black oak sapling growing out of the side of the canyon. The nest was fifteen feet from the ground and seventy-five from the bed of the canyon which is very deep with precipitous walls. The male came with a caterpillar but seeing me would not go to the nest. The female, however, fed the young and brooded them without pay- ing much attention to me. The least 4ommon of the three Vireos breeding in the Huachuca Mountains is the Western Warbling Vireo. I have located but four pairs after visiting all the principal canyons, but there may be others in some of the smaller canyons. One pair is near the reservoir in Miller Canyon. I spent two hours on June 4, 1907, looking for their nest, climbing all the likely looking trees. The male got very uneasy at my continued presence and finally called his mate off the nest. She be- gan calling with the usual Vireo alarm note and after locating her I watched very carefully for about ten minutes till she flew onto the nest, thirty feet up in a syca- more standing nearby on the edge of the creek. The nest was invisible from the ground and was well sheltered with leaves above. The female left the nest as I climbed up. There were four eggs with incubation begun. I secured good photo- graphs of this nest and eggs. On May 21, 1908, I was fortunate enough to locate a nest.just begun. The two birds were together in the tree tops nearby all the time. The male was sing- ing most of the time, the female responding from time to time with low notes which I cannot find syllables to describe. They were difficult to follow from tree to tree and it was sometime before I could tell where they were building. On June 1st the nest contained two eggs and June 4 I collected the nest and four eggs, tak- ingphotographs of them. The nest was placed in a fork near the top of a small ash growing well up from the bed of the canyon. The nest has the framework of grass tops like the two preceding species but the interwoven material is mostly a white parchment-like substance from the seed pods of the mescal. Bits of cobwebs complete the outside which is rather ragged in appearance and of a grayish white color. The lining is fine grass tops with the seeds removed as is the case with the other two. The average measurements of the nests of the three species as shown by speci- mens in my possession are as follows: Plumbeous Vireo: diameter, outside 3? inches; inside 2I? inches. Stephens Vireo: diameter, outside, 2? inches; inside 1? inches. Western Warbling Vireo: diameter, outside 3I? inches; inside 2 inches. Plumbeous Vireo: depth, outside 2? inches; inside 1? inches. Stephens Vireo: depth, outside 2I? inches; inside 1? inches. Western Warbling Vireo: depth, outside 2 inches; inside 1? inches. Tombslone, Arizona. 'NESTING OF THE PINE SISKIN AT GREAT SLAVE LAKE By RUDOPH M. ANDERSON HE Pine Siskin (?q?p?'?us p?'nus) appears to be a rather rare bird in the terri- tory along the Athabasca, Slave and Mackenzie rivers. Af least the writer met with the species on only one occasion during the season of 1908. On the morning of June 24, our party, on one of six scows and a York-boat, towed by the little steaming "Eva," pulled out of the delta of the Slave River, intending to cross the end of the lake to Hay River. A fairly strong wind was blowing from across the lake, causing heavy waves over the mud flats outside the mouth of the river,