122 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult (sex not determined). — Length (skin), 173.5; wing, 93; tail, 

 55; culmen, 22; tarsus, 31; middle toe, 20. 

 Yucatan (Tizimin). 



Furnarius pallidus Lawrence, Ann. N. Y. Acad. Sci., ii, no. 9, May 29, 1882, 



288 (Yucatan; coll. G. N. Lawrence). 

 Formicarius pallidus Laavrence, Ann. N. Y. Acad. Sci., ii, no. 9, 1882 (index). — 



BoucARD, Proc. Zool. Soc. Lond., 1883, 450 (Tizimin, Yucatan; crit.). — 



Reichenow and Schalow, Journ. fur Orn., 1884, 388 (reprint of orig. 



descr.). — Ridgway, Proc. U. S. Nat. Mus., xvi, 1893, 684 (monogr.). 

 [Formicarius] pallidus Sharpe, Hand-list, iii, 1901, 39. 

 F[ormicarius] m[oniliger] pallidns Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 



1908, 194, in text. 

 [Myrmornis] pallidus Heine and Reichenow, Nomencl. Mus. Hein. Orn., 1890, 



124. 

 Formicarius moniliger (not of Sclater, 185G) Sclater, Cat. Birds Brit. Mus., xv, 



1890, 303, part (Tizimin, Yucatan). — Salvin and Godman, Biol. Centr.-Am.,- 



Aves, ii, 1892, 233, part (Tizimin). 



FORMICARIUS MONILIGER UMBROSUS (Ridgway). 



NICARAGUAN ANTTHRUSH. 



Similar to F. m. moniliger but without any chestnut across foreneck, 

 the black of throat giving way, more or less abruptly, on chest to dull 

 slate color or sooty gray; under tail-coverts darker, more castaneous, 

 brown; terminal portion of auricular region, together with supra- 

 auricular region (sides of occiput) and sides of neck, varying from 

 chestnut to vinaceous-cinnamon. 



Young. — Much like adults but malar region, chin, and throat dull 

 whitish or buffy, transversely mottled or barred with dusky, or else 

 uniform dull sooty blackish; whitish abdominal area transversely 

 spotted or clouded with grayish dusky. 



Adult male.— l^evLgih (skins), 158-180 (164); wing, 86-93 (90.2); 

 tail, 49.5-57 (53.7); culmen, 19-23.5 (21.4); tarsus, 31-36 (33.5); 

 middle toe, 18-20.5 (19.1 ).« 



Adult /emaZe.— Length (skins), 146-170 (161); wing, 86-91.5 

 (88.3); tail, 48-55 (51.7); culmen, 19-22 (20.3); tarsus, 31.5-33.5 

 (32.3); middle toe, 17.5-20 (18.8).^ 



o Fourteen specimens. 



b Twelve specimens. 



Locality. 



Wing. 



Tail. 



Cul- 

 men. 



Tarsus. 



Middle 

 toe. 



MALES. 



Ton adult males from eastern Costa Rica.. 

 Four adult males from Nicaragua 



FEMALES. 



Ten adult females from eastern Costa Rica 

 Two adult females from Nicaragua 



00.0 



S9 



8S 



54.4 

 52.1 



51.4 

 53 



20.9 

 22.5 



20.1 

 21.3 



33.9 

 32.6 



29 

 32.3 



19.2 

 18.9 



18.7 

 19.3 



