332 



U. S. p. R. K EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



quill is longest ; the third, fourth, and first, successively, shorter. The tail is slightly emar- 

 ginate ; the lateral feathers very little shorter. The ash color of the crown does not extend 

 heyond the occiput. The sides of the head and neck are lighter olivaceous than the back. The 

 space around the lower eyelid is very little paler. The sides of the body are light olivaceous 

 green ; the under wing coverts and axillaries sulphur yellow. There are no whitish edgings 

 whatever on the wings and tail ; externally they are margined with the green of the back ; the 

 inner margins of the tail feathers similar, but lighter. There is no indication of a line of black 

 feathers on each side of the chin. 



Specimens from Texas are smaller, but otherwise similar. The female is smaller than the 

 male. 



There is a slight difference in the colors of the under tail coverts. These, sometimes, are 

 almost entirely white, at other times with decided tinge of greenish yellow, as in 7570. In 

 no North American specimens before me^ however, are there any of the characters of Vireo 

 bartramii, as given by Swainson. The proportions of the quills vary somewhat ; the first quill 

 sometimes equal to and sometimes a little shorter than the fourth, but it is always decidedly 

 longer than the fifth. The second and third quills are generally nearly equal ; the former is 

 sometimes the longer. 



List of specimens. 



VIREO FLAVOVIKIDIS, Cassin. 



Vireosylviajlavoviridis, Cassin, Pr. A. N. So. V, Feb. 1851, 152. — Is. VI -, pi. ii. (Panama.) 



Sp. Ch. — Second and third quills decidedly longest — equal ; first about intermediate between fourth and fifth, but considerably 

 longer than the latter. Above very light yellowish green. The sides of the body greenish yellow, in strong contrast to the 

 almost pure white of the under parts. The under tail and wing coverts and axillaries bright sulphur yellow. Crown ash color, 

 borderesl on either side by a brown line, below which is a bluish gray line from the bill over the eye to the side of the occiput ; 

 a dusky line from the bill through and behind the eye. Length, 6 inches ; wing, 3.25. 



Hub. — Northeastern Mexico to Panama. 



This species is of the same size with and somewhat similar to V. olivaceus, but may be readily 

 distinguished by the much brighter and more sulphur green colors of the upper parts ; the 



