64 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



feathers of dull rusty or cinnamon, these very broad and conspicuous 

 on tertials and greater wino-coverts; pale rump-patch also more or 

 less tinged with pale cinnamon or cinnamon-buff; cinnamon color of 

 chin and throat (usually deeper than in adults) extending over chest 

 and sides of breast and strong!}^ tinging sides and flanks. 



Adult male.— Length (skins), 110-127 (118.5); wing, 103-111 (108); 

 tail, 1:7-51 (50); exposed culmen, 6-7.5 (6.9); width of bill at frontal 

 antiffi, 5-6 (5.1); tarsus, 10-11 (10.1); middle toe, 8.5-10.5 (9.6).« 



Adult female.— Length (skins), 111-126 (117.8); wing, 95-104 

 (100.5); tail, 46-51.5 (48.8); exposed culmen, 6-7.5 (6.8); width of bill 

 at frontal antiffi, 4.5-6 (5.4); tarsus, 10-11 (10.3); middle toe, 9-11 

 (9.8).* 



Eastern Nicaragua (Rio Escondido) and Costa Rica (Angostura; Rio 

 Frio) southward through Colombia to western Ecuador (Babahoyo; 

 Chimbo; Esmeraldas; Vinces; Yaguachi), Venezuela (La Pricion), and 

 Trinidad. 



Cotyle flavigastra (not Hirundo flavigastra Vieillot) Cassin, Proc. Ac. Nat. Sci. 

 Philad., 1860, 133 (Panama R. R.).— Sclater, Proc. Zool. Soc. Lend., 1860, 

 274 (Babahoyo, w. Ecuador). — Lawrence, Ann. Lye. N. Y., vii, 1862, 317 

 (Panama R. R. ). , 



Coiyle rvficollis (not Hirundo r u ficollis YieiWot) Sclater, Proc. Zool. Soc. Lond., 

 1860, 292 (Esmeraldas, w. Ecuador); Cat. Am. Birds, 1862, 41. 



Cotyle uropygialis Lawrence, Ibis, April, 1863, 181 (Panama R. R. ; coll. G. N. 

 Lawrence); Ann. Lye. N. Y., viii, 1863, 3, 481. — Sclater and Salvin, Proc. 

 Zool. Soc. Lond., 1864, 348 (Panama R. R.).— Leotaud, Ois. Trinidad, 1866, 94. 



{Cotile'] uropygialis Gray, Hand-list, i, 1869, 73, no. 870. 



Stelgidopteryx xiropygialis Baird, Review Am. Birds, May, 1865, 317 (Isthmus 

 Panama). — Salvin, Proc. Zool. Soc. Lond., 1870, 184 (Chitra, Veragua); Ibis, 

 1870, 109 (Costa Rica).— Wyatt, Ibis, 1870, 184 (Colombia).— Sclater and 



« Eighteen specimens. 



''Ten specimens. 



Specimens from different localities average, respectively, as follows: 



I am unable to appreciate any constant difference between specimens from the 

 above-mentioned localities. Examples from Guiana have the rump much darker 

 and should be separated as belonging to a different form. 



