.] PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 5 I 1 



>road!y) pale brownish or brownish white; lower mandible brownish 



bite; legs and feet dusky brown. 



yanocorax argentigula Lawk. 



Young male (No. 12G8, Costa Eica National Museum, slopes of Irazu, 

 iosta Rica, June 24, 1887; Jose C. Zeledon). — Similar to the adult, but 

 o-ht bluish mark across anterior part of crown barely indicated; the 

 est of the crown, occiput, hind neck, and back dull blue, brightest on 

 op of head; wings and tail rather deep blue, and under parts duller 

 ud less purplish blue; whitish throat-mark as in adult, but lacking 

 he delicate purplish tinge. 



Young female (No. 116580, U. S. Nat. Mus., same locality, date, and 

 ollector). — Similar to the young male, but no trace of the lighter mark 

 cross anterior part of crown, the entire pileum, except frontlet and 

 lasal bristles, being uniform dull blue. 



Four adults, from the slopes of the Volcan de Irazu, present the fol- 

 owiug slight variations: 



Compared with the type they all have the throat-patch decidedly 

 )aler, its color being silvery white, with a very faint purplish tinge, in- 

 ,tead of light silvery gray, with a very strong tinge of purplish blue. 

 Che mark on top of the head is likewise much paler, the transverse ali- 

 enor portion being silvery white (faintly tinged with purplish blue in 

 ;wo specimens), the longitudinal supra-auricular portion pale purplish 

 )lue. In the type, this n -shaped mark is throughout of pale campan- 

 ila-bl lie tint, but appreciably paler on the broader anterior portion than 

 ;oward the extremities of the lateral arms. The blue of the remiges 

 lud rectrices is also of an appreciably greener or less purplish cast than 



lu the type. 



It is possible that these differences may be to a degree owing to dif- 

 ferent ages of the feathers, the plumage of the type being apparently 

 fresher than that of the other specimens. 



The live adults measure as follows : 



TJ. S. National Museum 



Costa RicaNational Museum 



do 



do 



Mid. 

 toe. 



.75 

 .73 

 .71 



Xiphocolaptes emigrans costaricensis, subsp. now 



Suesp. Char.— Similar to X. emigrans Scl., from Guatemala, but 

 huffy streaks on breast broader and size somewhat greater. 



Type, No. 115011, IT. S. Nat. Mus., Naranjo, Cartago, Costa Rica, 

 August, 1880; Jose C. Zeledon. 



This bird is described in detail on a subsequent page oi these 1 ro- 



ceediugs. 



