202 CALIFORNIA ACADEMY OF SCIENCES. 



tain number breed on the Sacramento and Feather 

 rivers. First seen at Stockton April 22, 1879, April 

 28, 1880. Dr. Cooper informs me that he saw it at 

 Emigrant Gap, on the Central Pacific Railroad, altitude 

 5,911 feet, April 29, 1870. It arrived at Nicasio April 

 5, 1876, according to Mr. C. A. Allen; at Beaverton, 

 Oregon, according to Mr. Anthony, on April 17, 1885, 

 and became common on the 30th of April, a few breeding 

 there. It is common in the densest fir forests of the 

 Sierras of Central California from about the first of May 

 until the middle of September, nesting frequently in 

 dogwood (Cornus NuttaUii). I have also found nests 

 in fir trees, on oaks, on Libocedrus, and in shrubs (Cean- 

 othus). I suppose Dr. Cooper refers to this form when 

 he says the solitary vireo is common in Washington 

 Territory, arriving froin the south in May. 



Suckley, 1860. Rather common near Fort Steilacoom. 



Henshaw, 1879. The eastern slopes of the Sierra and 

 Cascades appear to furnish, in summer at least, nothing 

 but typical cassinii, while from the Calaveras Grove, 

 California, and other localities on the western side of 

 the mountains, we have both typical and intermediate 

 specimens, both styles breeding. 



Ridgway. Noticed only in the canons of the west 

 Humboldt Mountains, where it is not uncommon in 

 September. 



224. Vireo solitarius plumbeus (Coues). Plumbeous 

 Vireo. 



Ridgway. The first locality where we met with this 

 species in traveling eastward was the eastern slope of 

 the Ruby Mountains where several other species char- 

 acteristic of the Rocky Mountain district were first 

 encountered, as Helminthophila virginicv, and Selasphorus 

 platycercus. It was rather common in July and August, 



