384 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



PLATYTRICCUS ALBOGULARIS i Sclater). 

 WHITE-THROATED SPADE-BILLED FLYCATCHER. 



Similar to P. cancrominus, but decidedly darker in color, the adult 

 male always (?) with a large patch of bright yellow on median portion 

 of crown and occiput." 



Adult Diale. — Pileum dark olive with a large central patch of lemon 

 yellow, originating at center of crown and extending over median 

 portion of occiput; hindneck, back, scapulars, rump, upper tail- 

 coverts and lesser w4ng-coverts plain brownish olive ; wings ( except 

 lesser coverts) and tail dusky with brownish olive or olive-brown 

 edgings, the middle coverts broadly tipped with the same color; sides 

 of head dusky or dusky olive, relieved hy a pale brownish buff or 

 buffy \\hi(ish supraloral streak and orbital ring and a spot of light 

 buffy brown or brownish buff near center of auricidar region; chin 

 and throat wliite; chest, sides, and flanks buffy brownish, fading, 

 into pale yellow (nearly straw 3'ellow) on abdomen, median portion 

 of breast, and under tail-coverts; axillars and under wing-coverts 

 pale yello\\ ish tinged a\ ith olive or grayish, the under primary coverts 

 brownish; inner web of remiges edged with pale l)rownish buff or 

 l)rownish white; l)ill blackish, the mandible with paler tomia and 

 tip; iris brown;'' legs and feet light brownish or horn color (in dried 

 skins); length (skins), S9-9S (92.8) ; wing, 55-63 (59.6) ; tail, 25-34.5 

 (30.9); exposed culmen, 10.5-lf .5 (f 1.2) ; tarsus, 17-19.5 (17.9); mid- 

 dle toe, 9-10 (9.6).'- 



Adult female. — Similar to the adidt male, but yellow crown-patch 

 much smaller, often (usually?) wanting; length (skins), 82-96 (89); 

 wing, 50-61 (56.6); tail, 24-34.5 (27.2); exposed culmen, 10.5-11.5 

 (11); tarsus, 15.5-17 (16.5); middle toe, 9-9.5 (9.2).^ 



" I find on careful comparison of a considerable series of each form that the throat is 

 little, if any, whiter in P. albogularis than in P. mncrominus; neither does it, as a 

 rule, contrast more strongly with the general color of the under parts. 



^W. W. Brown, manuscript. 



c Twelve specimens. 



d Five specimens. 



Costa Rican, Panama, and Colombian specimens compare in measurements as 

 follows: 



Locality. 



Five adult iiialos from ("osta Rica . 

 Seven adult males from Panama . . 



Wing. 



Thiree adult femaJes from VofUi \{ ica 



One adult female from i^anania. 



One adult female from Colombia (Concepcion, Sanla Marta) . 



Tail. 



Ex- 

 posed 

 culmen. 



Tarsus. 



Middle 

 toe. 



9.4 

 9.9 



9.2 



9 



9.5 



