1899.] NATURA.L SCIENCES OF PHILADELPHIA. 309 



Central America, and can be recognized at a glance from any of 

 the other species. 



Though its dark under surface makes it appear very different 

 from the white-throated and white-bellied T. striatulus, it is evi- 

 dently most closely allied to that species. 



Unfortunately, the label has been lost from the specimen, so that 

 the exact locality is unknown. 



The identification of this bird involved a study of all the South 

 and Central American species of Troglodytes, and an examination 

 of the specimens in the collections of the Academy and the U. S. 

 National Museum, the latter having been kindly loaned me for the 

 purpose. 



While the material is insufficient for a monograph, the results of 

 the investigation may be of value to those engaged in studying this 

 rather perplexing group. 



The tropical American species of Troglodytes may at once be sep- 

 arated into two groups, those with distinct superciliaries, sharply 

 defined against the color of the head, and those with superciliaries 

 indistinct. The first are not difficult, and stand as given in the 

 British Museum Catalogue, Vol. vi, p. 248. The other group is 

 much more confusing. 



From southern Mexico to Panama south of the range of T. 

 aedon and its races, we have a Wren with rufous-tinted rump and 

 tail, and vinaceous below% with under tail coverts strongly barred 

 with black, white and vinaceous. This is T. intermedins Cab. in 

 Nicaragua and northern Costa Rica (type loc, San Jose) and T. 

 inquietus Baird, in Costa Rica and Panama (type loc, Panama), 

 the more southern form differing in larger size. 



The two are, however, so close that it seems undesirable to sep- 

 arate them. 



In the vicinitv of Bogota we fiud a totally different bird, T. 

 striatulus, which compai'ed with the preceding is olive brown instead 

 of reddish brown above, and much hghter beneath, being pure white 

 on the throat and middle of the abdomen. The under tail coverts 

 are banded with black and white. 



Next to this comes the very much darker T. columb(e Stone 

 above described. 



The rest of South America is inhabited by various races of one 

 wide-ranging form, all of Avhich are peculiar in their strongly 



