258 Proceedings of the Biological Society of Washington. 



wholly rufous. The characters shown by the tail are pronounced and 

 constant, all our sixteen specimens of stictothorax having the inner vanes 

 of the four central feathers black or blackish, a mark which has almost 

 disappeared in our specimens of piuroe. The Machala specimen is clearly 

 referable to stictothorax and brings the known range of this form almost to 

 the Peruvian boundary. It is probable that the areas occupied by the 

 two races are divided by the Cerro de Amotape. 



Phacellodomus striaticeps griseipectus, new subspecies. 



Subspecific characters. — Throat and breast grayish vinaceous-buff, in- 

 stead of being essentially pure white; flanks and abdominal region much 

 deeper, the former nearly ochraceous-tawny; ear-coverts and sides of the 

 neck grayer, less cinnamon-rufous; upper parts averaging darker, with 

 less cinnamon-rufous, especially anteriorly. 



Type.— No. 145,210, Am. Mus. Nat. Hist., d" ad., July 2, 1916; Tica- 

 Tica, 11,500 ft., near Cuzco, Peru. F. M. Chapman. 



Specimens examined. — Phacellodomus striaticeps griseipectus. Peru: 

 Type locality, 5; La Raya, 1; Calca, 2; Cuzco, 5; Anta, 1; Huaracondo 

 Canon, 1. 



Phacellodomus striaticeps striaticeps. Bolivia: Cuchacancha, 11,000 

 ft., 7; Parotani, 8800 ft., 4; Vinto, 8600 ft., 3. Argentina: Tilcara, 8000 

 ft., Prov. Jujuy, 2; Tafi del Valle, 7000 ft., Prov. Tucuman, 3. 



Remarks. — Our excellent series of Phacellodomus striaticeps shows that 

 the characters on which this proposed new race is founded are both pro- 

 nounced and constant. The marked differentiation in the color of the 

 under parts is evidently not due to the earthy stain which often is found 

 upon the feathers of these and other ground-inhabiting species of this 

 family. Earth-stained birds are found in the series of both forms, and 

 its presence in no way obscures the real characters by which they may be 

 distinguished. 



Hylocryptus, new genus. 



Generic characters. — A typically furnariine bird; the difference in length 

 between the inner and outer toes less than the difference between the 



latter and the middle toe; the 

 nostril-entrance oval, non-opercu- 

 late; apparently most nearly re- 

 V v" ^ -^^"""Vf^v la ted to A utomolus but with a long- 



^^^.S -><'£- _ er, proportionately more slender 

 bill, the gonydeal angle barely evi- 

 dent, the maxilla as well as man- 

 dible terminally decurved; the 

 culmen from base decidedly longer 



Fig. 3— Bill of Hylocryptus erythrocephalus. than tai'SUS, its depth at the gony- 



( Natural size ) (j ea l angle less instead of more 



than three times its length from nostril. Type, Hylocryptus erythro- 

 cephalus. 



