VOL. XVI, PP. 17-18 FEBRUARY 21, 1903 



PROCEEDINGS 



OP THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW VIREO. 

 BY HARRY C. OBERHOLSER. 



The vireos of the bellii type from southwestern Texas, though 

 in certain respects intermediate between Vireo bellii bellii and 

 Vireo bellii pusillus seem to be sufficiently distinct from either 

 to require a name. In view of this they may be called 



Vireo bellii medius, subsp. nov. 



Chars, subsp. Similar to Vireo bellii bellii, but paler, more grayish 

 above; paler and much less extensively yellow below. 



Geographical distribution. Southwestern Texas, and immediately ad 

 jacent portion of Mexico. 



Description. Type, adult male, No. 168275, U. S. N. M., Biological Sur 

 vey Collection; Boquillas, Texas, May 24, 1901; H. C. Oberholser. Head 

 and nape brownish gray; back and scapulars dull grayish olive green, the 

 rump rather brighter; wings and tail fuscous, margined exteriorly with 

 olive, the former crossed by two distinct dull white bars; lores grayish 

 white; sides of head and neck pale brownish gray; underparts white, 

 washed with yellowish across the breast; flanks and sides of body pale 

 olive yellow; under tail-coverts yellowish. 



The differences between this race and true bettii are most evident in 

 the much more grayish head, the decidedly darker back, and in the 

 restriction of the yellow of the flanks and sides the middle of abdomen 

 and breast being almost pure white. In size there appears to be no 

 material difference. From Vireo bellii pusillus it may be distinguished 

 by its darker, less uniform upper surface, the back being distinctly olive 

 8 PBOC. BIOL. Soc. WASH. VOL. XVI, 1903. iyi) 



