346 



Bulletin American Museum of Natural History. [Vol. XXXVI, 



from' the Central Andes and Ecuador in having, as a rule, the underparts 

 deeper, more spots on the throat, a barred rump and, to some extent, barred 

 tail-coverts, while the outer pair of rectrices has more or less yellowish brown 

 on the center web. While Boissonneau gives no type-locality, his descrip- 

 tion obviously refers to the Bogota bird. 



El Pinon (above Fusugasuga), 3; Subia (near Bogota), 1; Palo Hueco, 

 Cundinamarca, 2; Chipaque, 1. 



(1666) Hypoxanthus rivolii brevirostris Tacz. 



Hypoxanthus brevirostris Tacz., P. Z. S., 1874, p. 546 (Higos, Cen. Peru). 

 Hypoxanthus rivolii ScL. & Salv., P. Z. S., 1879, p. 533 (Retiro, Sta. Elena). 



Our specimens of this race are all from the Central Andes where the bird 

 inhabits the Temperate Zone descending in clearings to the upper border 

 of the Subtropical Zone; 



Hargitt (Cat. Bds. B. M., XVIII, p. 31) has called attention to the large 

 size of Colombian specimens of this form. I have no examples from Peru, 

 but Ecuadorian birds are but little larger than measurements given by 

 Taczanowski {I. c.) and are evidently very near true brevirostris. As the 

 appended table shows, however, birds from the Central Andes are much 

 larger. I can detect no differences in color, but those in size appear to be 

 constant, and may warrant the separation of a northern form of brevi- 

 rostris. It is surprising to find that three specimens from Merida agree 

 with brevirostris rather than rivolii in color; while instead of showing the 

 progressive increase in size from the south northward, exhibited by other 

 birds in our series, these Merida birds are nearer specimens from Ecuador 

 than those from Bogota. 



Laguneta, 1; Santa Isabel, 1; Volcancito, 1; El Eden, 2. 



Measurements of Males. 



1 Taczanowski, P. Z. S., 1874, p. 547, The discrepancy ia tail measurements is evidently <Jue to 

 a diflference in methods of measurements. All the other measurements of the tail here given are from 

 the insertion of the central pair of feathers to the end of the longest one. 



