BIRDS OF NORTH AND MIDDLE AMERICA. 123 
Eastern and northern Costa Rica (Talamanca; Bonilla; Jiménez; 
Rio Matina; Cudbre; Guacimo; Guapiles; La Vijégua; La Florida; 
Volcan de Miravalles; Pacuare; San Carlos) and Nicaragua (Mosquito 
coast; Los Sébalos; Rio Escondido; San Emilis, Lake Nicaragua). 
Formicarius moniliger (not of Sclater, 1856) Scuarer, Proc. Zool. Soc. Lond., 
1858, 278, part (Mosquito coast, Nicaragua). 
Formicarius hoffmanni (not Myrmornis hoffmanni Cabanis) Boucarp, Proc. Zool. 
Soc. Lond., 1878, 62 (San Carlos, Costa Rica; habits) —ZEtep6n, Proc. 
U.S. Nat. Mus., viii, 1885, 108 (Costa Rica); Anal. Mus. Nac. Costa Rica, 
1887, 115, part (Jiménez, Costa Rica).—Satvin and Gopman, Biol. Centr.- 
Am., Aves, ii, 1892, 234, part (Los Sébalos, Nicaragua; San Carlos, Jiménez, 
and Pacuare, Costa Rica).—Ricumonp, Proc. U. 8. Nat. Mus., xvi, 1893, 
502 (Rio Escondido, Nicaragua; habits). 
Formicarius hoffmani Nutrine, Proc. U. 8. Nat. Mus., vi, 1883, 405 (Los SAbalos, 
Nicaragua; habits; notes). 
[Formicarius] hofmanni Scuater and Savin, Nom. Av. Neotr., 1873, 75, part. 
Formicarius umbrosus Ripgway, Proc. U. 8. Nat. Mus., xvi, no. 961, Nov. 28, 
1893, 681 (Talamanca, Costa Rica; coll. U. 8. Nat. Mus.).—UnpErwoop, 
Ibis, 1896, 441 (Volcan de Miravalles, Costa Rica; habits; notes).—Car- 
RIKER, 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. wmbrosus, but under tail-coverts clear tawny or 
tawny-chestnut (asin 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) .2 
As in the young of F. m. umbrosus, the young of this form fre- 
quently have the malar region, chin, and throat white barred or 
transversely spotted with black. 
@ Asin 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 ter- 
minal portion of auricular region. 
5 Ten specimens, from Costa Rica. 
