^TsaT'] PROCEEDINGS OF THE NATIONAL MUSEUM. fil3 



ochraceous-butif, iiu'liiiiny,- (<» t.iwuy iiloiig sides. Tlicic is no jidinix- 

 ture of brown in the black of the pileuiu. Lcnjith (skin), (1.30; wiug, 

 3.40; tail, 2.58; exposed cubnen, 0.00; tarsus, 0.75. 



The three females of this form which are now on view agree in the much 

 brighter or more castaneous coloration of the upper parts, by which 

 character they may be immediately separated from females of any 

 other of the local forms of this species. In the clearness of this rusty 

 coloring of the upper parts they come nearest P. a. latirostris, in 

 which, however, the coh)r is very much paler, while the pilenm is dull 

 slate-color instead of glossy black. 



8. Sclerurus canigularis Ridgw. (Proc. U. 8. Nat. Mus., xii, No. 762, February 5, 



1890, 24.) 



An immature female (No. 8281, Museo Nacional de Costa Eica, 

 Buena Yista, Costa Eica, August 14, 1892, Castro y Fernandez) is 

 closely similar to the type of the species (an adult female), but has the 

 upper parts rather more castaneous and the chest a little less so. Its 

 measurements are as follows: Length (skin), 5.70; wing, 3.40; tail, 

 2.35; exposed culmen, 0.80; tarsus, 0.88; middle toe, 0.72. 



This bird is certainly distinct, at least subspecifically, from iV. al- 

 bif/nlaris Sel. 



9. Scytalopus argentifrons Ridgw. (Proc. U. S. Nat. Mus., xiv, No. 8(59, 1891, 475.) 

 AduJt male (ISTo. 6379, Museo ISTacional de Costa Eica, Yolcan de 



Irazii, July 31, 1891): Forehead and anterior half of crown (back to 

 a little past posterior angle of eyes), delicate silvery gray or cinereous, 

 this color extending backward laterally, above ear-coverts, to the 

 hinder part of the occiput (terminating about half an inch from poste- 

 rior angle of the eye) ; lores and anterior portion of the forehead a 

 little darker and browner gray; orbital region nearly black, especially 

 above the eye; postocular streak, occiput, hind part of crown, hind 

 neck, back, scapulars, and wing-coverts uniform slate-black; remiges 

 and rectrices similar but slightly browner; rump and upper tail-coverts 

 dark bister-brown, barred with blackish. Ear-coverts, malar region, 

 chin, and throat slate-gray (slightly darker on the first), gradually 

 deepening on sides of breast to dark slate color, the sides and belly 

 dark slate-color, with broad pale gray tips, these light tips still paler* 

 and less pure, gray on lower median portion of belly; flanks, anal 

 region, and under tail-coverts dusky black, each feather broadly tipped 

 with light russet or tawny-brown, producing a heavily barred effect. 

 Bill entirely deep black; legs and feet rather dark horn-color, the outer 

 side of the former considerably darker. Length (skin), 4.70; wing, 

 2.00; tail, 1.55; culmen (to base), 0.52; exposed culmen, 0.43; tarsus, 

 0.83; middle toe, 0.70. 



This specimen differs from the type and the example which accom- 

 panied it (as described in these ^' Proceedings," Vol. xiv, pp. 475, 476), 

 as follows : The frontal silvery patch is more extensive,* and exhibits 



* Regarding the extent and shape of this patch in the original speeiniens due 

 allowance should be made lor their imperfect condition. 



