150 Oberholser Description of a New Telmatodytes. 



neck; postocular streak dark brown; sides of neck brown like the crown, 

 but paler; cheeks and lores mixed white and brownish; lower surface 

 white, the sides and flanks brownish ochraceous, also the breast tinged 

 with this color; crissum brownish ochraceous, terminally whitish, and 

 narrowly barred with dusky; lining of wing white. 



This new form is most closely allied to Telmatodytes palustris palustris, 

 from which its range is, however, widely separated, but it may be distin 

 guished by its decidedly inferior size (being apparently a little smaller 

 than even T. p. mariance), duller, less reddish brown upper parts, besides 

 having the brownish of sides and flanks spread over the breast and other 

 wise more extended. The type of thryophilus is in perfectly fresh 

 autumn plumage, the condition which seems most nearly to resemble 

 palustris, for summer specimens are paler, more grayish, and present a 

 stronger contrast to palustris of even corresponding season. 



The subjoined millimeter measurements of males of the three forms 

 concerned in this comparison were taken by Mr. Ridgway, and he has 

 courteously offered them for inclusion here. 



