April 1904] BIRDS OF THE HUACHUCA MOUNTAINS, ARIZONA. 49 



pursuing the females. On April 17, 1902, several nests containing from 

 one to three eggs were examined, and the first containing a full set was 

 one containing six eggs, found on April 22nd. An immature bird taken 

 on July 26th, is still to a great extent in the grayish brown vermiculated 

 juvenile plumage, but another, shot on August 6th, is hardly distinguish- 

 able from the adult. An adult male taken on August I7th has almost 

 completed the moult, the only old feathers remaining being a few in the 

 wings and tail. It is appreciably darker than the spring specimens. 



Vireo olivaceus (Linnaeus). Red-eyed Vireo. 



I have an adult male of this species taken in the Huachuca Moun- 

 tains by R. D. Lusk on May 20, 1895. It is probably a mere straggler 

 to this region. 



Vireo gilvus swainsoni (Baird). Western Warbling Vireo. 



A very common migrant ; but though I thought it possible that a 

 few might remain to breed in these mountains, I was unable to detect 

 any during the breeding season, and they probably go further north ; 

 though from the early date at which they reappeared in the fall their 

 breeding ground cannot be at any great distance to the northward. The 

 earliest date at which I have seen this species in the spring was April 

 21, 1002 ; the following year the first seen was on April 3Oth. They were 

 found in all parts of the mountains, though probably most abundant in 

 the oak region, below 6000 feet, and remained in tolerable abundance 

 until about the third week in May. They reappeared before the end of 

 July; I saw several on July 2/th, and, though not as abundant as in the 

 spring, they were to be found all through the oak region during the 

 month of August. 



Vireo solitarius cassini (Xantus). Cassin Vireo. 



A common migrant, found throughout the mountains. The earliest 

 arrival noted in the spring was on April 9th, and the last seen on May 

 22nd. On September 3, 1902, I saw several and secured two, a male and 

 a female, in newly acquired autumnal plumage. 



Vireo solitarius plumbeus (Coues). Plumbeous Vireo. 



During the spring migration the Plumbeous Vireo is quite abundant 

 in all parts of the mountains ; and at this time I took several specimens 

 from the base of the mountains up to the top of the highest peaks. 



During the summer it is not so numerous, though still a fairly com- 

 mon bird, and the breeding birds occupy a more restricted area, being 

 found along the canyons, from 6000 to 8000 feet. In 1902, the first seen 

 was on May 6th; in 1903, one was secured. on May ist, and on May 5th, 

 one was seen at work at a nest which was already well started. Speci- 

 mens collected show considerable variation in color, and though I took 

 none that could be confused with cassini, still some have a considerable 

 admixture of greenish-yellow on the sides and flanks ; though the ma- 

 jority have those parts plain, dark plumbeous. A female shot on May 

 nth, has a number of old, worn feathers scattered over the crown and 

 back as though it were just completing a moult. 



Vireo huttoni Stephens! Brewster. Stephens Vireo. 



Possibly this species remains in the Huachucas Mountains through- 

 out the winter, but I am inclined to doubt it, and if it does it must be in 

 very limited numbers. I secured a single bird as early as February 

 2oth, but no more were seen until March 2nd, when another was taken ; 



