SYNONYMY OF VIREO ATEICAPILLUS 533 



Mr. Kidgway has since found the Least Vireo to be abundant 

 in the vicinity of Sacramento, where he discovered a nest; and 

 several other observers, notably Mr. Heushaw, have met with 

 it in various portions of Arizona. It does not appear to reach 

 the more elevated parts of that Territory, in the pine-belt of 

 which Vireo vicinior is found and V. plumbeus is abundant. 

 Its habits, as far as known, correspond closely with those of 

 BelPs and the White-eyed Yireo ; and Dr. Brewer describes two 

 nests from Arizona as substantially like those of the former 

 species. Each contained three eggs, and in one of them there 

 was also a Cowbird egg, supposed, from its small size, to have 

 been laid by Molothrus obscurus. The Vireo's eggs measured 

 0.69 by 0.56, and were of crystalline whiteness, speckled with 

 red and reddish-brown the markings being very minute and 

 scarcely discernible in some cases, in others larger and more 

 distinct. 



Black-capped Greenlet 



Vireo atricapillus 



Vireo atricapilla, Woodh. Pr. Phila, Acad. Apr. 1852, 60 (Rio San Pedro, Texas). Bd. Rep. 



Great Salt Lake, 1852, 328. Woodh. Rep. Zuni & Colo. R. 1853, 75, pL 1. 

 Vireo atricapillus, Cass. Illust. B. Cal. & Tex. 1854, 153, pL 24. Bd. BNA. 1858, 337. Bd. 



U. S. & Mex. B. Surv. ii. pt. ii. 1859 ; Birds, p. 12 (Devil's River, Texas). Bd. Rev. AB. 



1866, 353, fig. Coop. B. Cal. L 1870, 121. Corns, Key, 1872, 124.-5. B. & B. NAB. i. 1874, 



383, pL 17, f. 6 (Mazatlan). 

 Black-headed or Black-capped Vireo, Authors. 



HAB. Texas to Mazatlan. 



CH. SP. Eemigibus x. $ olivaceus infra albus lateribus viren- 

 tibus, alis albido bifasciatls, rostra pileo genisque nigris, lor is 

 orbitisque albis. ? 9 pileo schistaceo. 



$ : Top and side of the head black, excepting a white eye-ring and white 

 loral stripe. Upper parts olivaceous ; lower parts white, tinged with pale 

 greenish on the sides and flanks. Wings and tail blackish, edged with 

 olivaceous, the former with two dingy whitish bars across the ends of the 

 greater and median coverts j lining of wings yellowish. Bill black ; feet 

 dark ; iris red. Length, 4f ; extent, 7 ; wing, 2J ; tail, nearly 2 ; bill, -J ; 

 tarsus, ; middle toe and claw, i ; first primary exposed for f- of an inch. 



A specimen from Mazatlan, supposed to be a female, is described by Baird 

 and Ridgway as having the black of the head replaced by dark slate color, 

 the upper parts duller olive, the lower somewhat buffy. The black cap of 

 the male renders the species conspicuous among all its congeners. 



NO more than four specimens of this very rare Vireo are 

 known to naturalists. Dr. S. W. Woodhouse, the dis- 

 coverer of the species, procured two males in Western Texas, 

 near the head of the Eio San Pedro, on tho 26th of May, 1851. 



