108 



Bangs Birds from Costa Rica and Chiriqui. 



Xenicopsis variegaticeps idoneus subsp. nov. 



Tape from Boquete, Chiriqui. Adult d*. No. 8943, coll. of E. A. and O. 

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



Characters. Similar in size and proportions to true Xenicopxis varifgaticeps 

 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 ^Y. vurtefftilicfps rich reddish brown. 

 The back and rump in X. variegnlnxps idnmiiA are paler and more oliva 

 ceous, less reddish brown than in true A', wtriegatiorp*. 



From A", temporulis (/Scl.) of Ecuador, the Chiriqui bird differs in having 

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



MKASUKI-MKNTS. 



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

 northern and southern examples of Anabiizenop* varirgaliwps, in Catalogue 

 of Birds, Vol. XV, pp. 106-107, but so far as I am aware the species has not 

 been subdivided by name till now. 



The eight specimens collected by Brown on theVolcande 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 the new 

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

 referable to true A", variegaticep*. 



X. wtriegntiwp* idoneus is an intermediate form, between true X. variegati 

 ceps and X. temporal!*, though different enough from either to be recognized 

 by name. 



Thryorchilus ridgwayi sp. nov. 



Type from Vulcan Irazu, Costa Rica. Adult (cT?).* No. 17,152, coll. of 

 E. A. and 0. Bangs. Collected March 4, 1899, by C. F. Underwood. 



Characters. Similar to Thryorchilus browni (Bangs) of the Volcan de 

 Chiriqui but slightly larger and color of upper parts 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 rump and upper tail coverts. 



MEASUREMENTS. 



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. 

 fColl. U. S. National Museum. 



