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Rh Eastern and northern Costa Rica (Talamanca; Bonilla; Jiménez; Rio Matina; Cuábro; Guácimo; Guápiles; La Vijágua; La Florída; Volcan de Miravallos; Pacuare; San Carlos) and Nicaragua (Mosquito coast; Los Sábalos; Rio Escondido; San Emilis, Lake Nicaragua).


 * Formicarius moniliger (not of Sclater, 1856), Proc. Zool. Soc. Lond., 1858, 278, part (Mosquito coasl, Nicaragua).
 * Formicarius hoffmanni (not Myrmornis hoffmanni Cabanis), Proc. Zool. Soc. Lond., 1878, 62 (San Carlos, Costa Rica; habits). — , Proc. U. S. Nat. Mus., viii, 1885, 108 (Costa Rica); Anal. Mus. Nac. Costa Rica, 1887, 115, part (Jiménez, Costa Rica). — and , Biol. Centr.-Am., Aves, ii, 1892, 234, part (Los Sábalos, Nicaragua; San Carlos, Jiménez, and Pacuare, Costa Rica). — , Proc. U. S. Nat. Mus., xvi, 1893, 502 (Rio Escondido, Nicaragua; habits).
 * Formicarius hoffmani, Proc. U. S. Nat. Mus., vi, 1883, 405 (Los Sábalos, Nicaragua; habits; notes).
 * [Formicarius] hoffmanni and, Nom. Av. Neotr., 1873, 75, part.
 * Formicarius umbrosus, Proc. U. S. Nat. Mus., xvi, no. 961, Nov. 28, 1893, 681 (Talamanca, Costa Rica; coll. U. S. Nat. Mus.). — , Ibis, 1896, 441 (Volcan de Miravalles, Costa Rica; habits; notes). — , Ann. Carnegie Mus., vi, 1910, 624 (Caribbean and northern Pacific lowlands of Costa Rica, up to 1,200 ft.; habits; descr. nest and eggs).
 * [Formicarius] umbrosus, Hand-list, iii, 1901, 39.

FORMICARIUS MONILIGER HOFFMANNI (Cabanis.)

Similar to F. m. umbrosus, but under tail-coverts clear tawny or tawny-chestnut (as in F. m. panamensis), and black of throat usually more sharply defined and abruptly contrasted with the dark slate color of chest. Differing from F. m. panamensis in larger size and less brownish coloration.

Adult male. — Length (skins), 153-173 (163); wing, 90-98.5 (93.5); tail, 51.5-56.5 (54.1); culmen, 19.5-23 (21.2); tarsus, 31.5-34 (33.5); middle toe, 19-21.5 (20.4).

Adult female. — Length (skins), 155-170 (161); wing, 88-95 (91); tail, 47-55 (51.1); culmen, 21-22.5 (21.7); tarsus, 31.5-34.5 (33.5); middle toe, 19-20.5 (19. 9).

As in the young of F. m. umhrosus, the young of this form frequently have the malar region, chin, and throat white barred or transversely spotted with black.