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) Sclater, Proc. Zool. Soc. Lond., 1858, 278, part (Mosquito coasl, Nicaragua).
- Formicarius hoffmanni (not Myrmornis hoffmanni Cabanis) Boucard, Proc. Zool. Soc. Lond., 1878, 62 (San Carlos, Costa Rica; habits). — Zeledón, Proc. U. S. Nat. Mus., viii, 1885, 108 (Costa Rica); Anal. Mus. Nac. Costa Rica, 1887, 115, part (Jiménez, Costa Rica). — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1892, 234, part (Los Sábalos, Nicaragua; San Carlos, Jiménez, and Pacuare, Costa Rica). — Richmond, Proc. U. S. Nat. Mus., xvi, 1893, 502 (Rio Escondido, Nicaragua; habits).
- Formicarius hoffmani Nutting, Proc. U. S. Nat. Mus., vi, 1883, 405 (Los Sábalos, Nicaragua; habits; notes).
- [Formicarius] hoffmanni Sclater and Salvin, Nom. Av. Neotr., 1873, 75, part.
- Formicarius umbrosus Ridgway, Proc. U. S. Nat. Mus., xvi, no. 961, Nov. 28, 1893, 681 (Talamanca, Costa Rica; coll. U. S. Nat. Mus.). — Underwood, Ibis, 1896, 441 (Volcan de Miravalles, Costa Rica; habits; notes). — Carriker, 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 Sharpe, Hand-list, iii, 1901, 39.
FORMICARIUS MONILIGER HOFFMANNI (Cabanis.)
HOFFMANN'S ANTTHRUSH.
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.[1]
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).[2]
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).[2]
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.
- ↑ As in F. m. panamensis, there is in this form sometimes a more or less distinct indication of a chestnut or russet collar across the lower throat. Such specimens may be easily distinguished from F. m. moniliger by the very different color of the under tail-coverts (clear tawny or tawny-chestnut instead of light olive-brown and dusky), and much lighter, as well as more extended, color (deep vinaceous-cinnamon to cinnamon-rufous, instead of dull chestnut) of sides of neck and occiput and terminal portion of auricular region.
- ↑ 2.0 2.1 Ten specimens, from Costa Rica.
