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 MAY. x9o3 [ THE CONDOR 63 Although rather shy at first the. old birds became tamer after we had stayed around near the nest for a time. Their shyness we found was only an indication of their finer natures. They paid no particular attention to the camera, covered witl leaves and branches, until they heard the sharp click of the shutter. This they regarded with suspicion and alarm and it was not till after the third day that the parents did not take immediate flight at the snap of the shutter. The Cassin vireo is readily distinguished from the warbling vireo because it is slightly larger in size and has a clear white ring about the eye and a white loral streak. The wing has the two white bars, distinguishable in both old and young birds, and light-edged feathers, while the under parts are white, tinged with yel- low in contrast to the dull olive-green on the back. The western warbling vireo seems to nest a little later than the Cassin. On June 5th of last year, while following up a little mountain stream, we were at- tracted by the call of one of these birds and soon discovered the cup-shaped nest tied to the limbs of a hazel bush only four feet from the ground, a good position for the photographer. The nest was completely concealed by leaves from one side and was built so as to be well sheltered by a leaf from above. The first morning we discovered the nest it contained four eggs and one newly hatched bird. It seemed to be an exceedingly restless and anxious time for the mother; as we watched her from the tall ferns, she kept putting her head down under her body to view her first-hatched and to see how the other eggs were pro- gressing.