108 



Bangs — Birds from Costa Rica and Chiriqid. 



Xenicopsis variegaticeps idoneus «nl)si). nov. 



Tape from Boquete, Chiriqiii. Adult J*. No. 8943, coll. of E. A. and 0. 

 Bangs. Collected March 4, 1901, by W. W. Brown, Jr. 



Characters. — Similar in size and j)roportion.s to true Xenicojjsi.'i rariir/dliceps 

 Sol. of Costa Rica to southern Mexico (type locality, southern Mexico), 

 but strikingly different in the color of underparts, which in the new form 

 are dull yellowish olive, and in true X. nirlci/aliceps rich reddish l)n>wn. 

 Tlie back and rump in X. variei/'dicrpti idonen-s are paler and more oliva- 

 ceous, less reddish brown than in true A', variegaticeps. 



From A', tempontlix ^8cl.) of Ecuador, the Chiriqui bird differs in having 

 the shaft spots on breast and belly nuich less well developed. 



MKASIJIM-MKNTS. 



In 1890 Dr. Sclater called attention to the differences in color between 

 northern and southern examples of .\ iKilidzeiiop.i variegalircj)^, in Catalogue 

 of Birds, Vol. XV, pi>. 10()-107, but so far as I am aware the si)ecies has not 

 been subdivided by name till now. 



The eight specimens collected by Brown on the Volcande Chiriqui from 

 4,000 to 4,800 feet altitude vary but little one from the other and are all 

 very different in color from northern examples. The range of tiie new 

 form does not extend north of Chiriqui, Costa Kican examples being wholly 

 referable to true A. variegaticeps. 



X. variegatirejts idoneus is an intermediate form, between true A', variegati- 

 ceps and X. leinjxirnlis, though different enough from either to be recognized 



by name. 



Thryorchilus ridgwayi sj). nov. 



Type from Volcan Irazii, Costa Rica. Adult ((5" ?)•* No. 17,152, coll. of 

 E. A. and O. Bangs. Collected March 4, 1899, l)y C. F. Underwood. 



Charaelers. — ISimilar to Tliniorchilas liroirni (Bangs) of the Volcan de 

 Chiriqui but slightly larger and color of njiper j>arts and flanks darker and 

 decidedly more olivaceous, less reddish brown — almost bistre on head, back, 

 flanks, under tail coverts and anal region, gradually shading into mummy 

 brown on runq) and upper tail coverts. 



MEASUItKMENTS. 



When Mr. Ridgway packed up for shipment the Underwood collection 

 he discovered among the wrens it contained one skin belonging to this 



*The type was not sexed by the collector but undoubtedly is a male. 

 tCoU. U. S. National Museum. 



