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U. S. p. E. E. EXP. AND SURVEYS — ZOOLOGY — GENERAL REPOET. 



this name described on page 59, and there called likewise Thryotliorus arundineus, is the Certhia 

 2)alustris of Wilson. The bird he described in 1807 as " Troglodyte des roseatix," or Troglodytes 

 arundinaceiis, is as certainly Sylvia ludoviciana of Latham. Vieillot unquestionably knew the 

 latter species in 1816, as he had described it in 180Y, although its biography of that date 

 belonged to the first mentioned bird. For this reason, therefore, in the necessary uncertainty 

 of the case, I am inclined to differ from Gray, and to consider the Sylvia ludoviciana as the 

 type, especially as the necessity of a new generic name will thereby be avoided. 



Synopsis of species. 



Tail feathers light brown, with bars of black. Superciliary stripe extending far back on the 

 neck, and spotted with black. Tail about equal to the wings. 



Lateral tail feather a quarter of an inch shorter than longest. Above, reddish brown ; 



beneath, pale yellowish rusty ; sides plain T. ludovicianus. 



Lateral tail feathers half an inch shorter than longest. Above, reddish brown ; beneath 



bright reddish brown on the sides and behind ; sides obsoletely barred... jT. herlandieri. 



Lateral tail feathers black, varied with white. Superciliary stripe confined to the neck. Tail 



longer than the wings T. hetuichii. 



Comparative measurements of species. 



' Thryothorut maruUpcdin, Lakr. Rev. /oiil. IS-IS, 338. 



